{"product_id":"sierra-ts26621-marine-coolant-temperature-sender-240","title":"Sierra TS26621 Marine Coolant Temperature Sender 240°","description":"\u003cp class=\"nvn-hero\"\u003eThe Sierra TS26621 is a marine coolant temperature sender, the brass fitting that feeds your dash gauge an honest reading of how hot the engine's running. It threads in with a 3\/8-18 pipe thread, wires to a 10-32 stud terminal, and matches a standard 240 degree marine gauge. When your temp needle goes squirrelly, this is usually the fix.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eThe Sierra Marine TS26621 is a coolant temperature sender, the small brass fitting that threads into your engine and tells the dash gauge how hot things are running. It's a wear part. When it fails, your temperature gauge either goes dead, pegs to the top, or bounces around for no reason. Swapping in a fresh sender is one of the cheapest, most satisfying fixes on a marine gas engine.\u003c\/p\u003e\n\u003cp\u003eThis one uses a 3\/8-18 pipe thread, so it screws into the standard sender port on most gas sterndrive and inboard engine blocks or thermostat housings. The single terminal is a 10-32 stud, the same small threaded post you'll find on a factory sender, so your existing gauge wire and ring terminal land right back on it. And it's matched to a 240 degree gauge, which is the common sweep for marine temperature gauges. That last part matters more than people think. A sender has to speak the same resistance language as your gauge or the needle reads wrong all day.\u003c\/p\u003e\n\u003cp\u003eSierra builds these to meet or exceed the original equipment part they replace. If you've got a factory sender that's aged out, this is a like-for-like swap in most cases, no rewiring, no adapter, no gauge recalibration. That's the whole point of a quality aftermarket sender. It should disappear into the job.\u003c\/p\u003e\n\u003cp\u003eInstall is straightforward if you've done any engine work. Let the engine cool, back out the old sender, and clean the port threads. We like a light wrap of thread sealant or a dab of conductive sealant on the threads. Go easy on standard Teflon tape if the sender grounds through its body, because too much tape can insulate the ground path and give you a flaky reading. Thread the new one in by hand first so you don't cross-thread the port, then snug it with a wrench. Don't gorilla it. Brass is soft and the port is usually aluminum or cast iron, and an over-torqued sender can crack a boss or strip a thread. Land your gauge wire on the 10-32 stud, tighten the small nut, and you're done.\u003c\/p\u003e\n\u003cp\u003eHow do you know the old one's the problem and not the gauge? Classic symptoms are a temperature needle that reads cold when the engine is clearly warm, a needle pegged hot when the engine is fine, or a reading that jumps around with rpm or vibration. A quick check is to disconnect the sender wire with the key on. If the gauge swings full one way, the wiring and gauge are usually fine and the sender is the suspect. From there it's a five minute part swap.\u003c\/p\u003e\n\u003cp\u003eThis is a sender only. It doesn't come with a wiring harness, a gauge, or an adapter bushing, so if your port is a different thread you'll want the right reducer, and if you're building a fresh gauge setup you'll source the gauge and harness separately. For a straight replacement of a tired factory sender though, this is usually all you need.\u003c\/p\u003e\n\u003cp\u003eSierra has been supplying marine engine and drive parts for decades, and they build to survive the environment they live in. Heat cycling, moisture, salt air, and constant vibration are hard on any sensor, and a temperature sender sits right in the thick of it, threaded into a hot engine and splashed by whatever's in the bilge. That's why we stick with proven marine-grade parts here instead of a generic automotive sender that wasn't built for the water.\u003c\/p\u003e\n\u003cp\u003eWho's this for? Anybody running a gas sterndrive or inboard who's chasing a temperature gauge that's gone squirrelly, doing a repower, or refreshing an older rig's engine instrumentation. It's a small, honest part that does one job well. And at this price, it's worth keeping a spare in the boat's parts box. A dead temp gauge on the water is the kind of thing that turns a good day into a nervous one, and this is cheap insurance against it.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003e3\/8-18 pipe thread fits the standard sender port on most marine gas sterndrive and inboard engines, so it's a direct thread-in swap\u003c\/li\u003e\n  \u003cli\u003eMatched to a 240 degree marine temperature gauge, so the needle reads accurately across the normal operating range\u003c\/li\u003e\n  \u003cli\u003e10-32 stud terminal accepts your existing gauge wire and ring terminal without rewiring\u003c\/li\u003e\n  \u003cli\u003eBrass body built to handle marine heat cycling, moisture, and vibration\u003c\/li\u003e\n  \u003cli\u003eMeets or exceeds the OEM sender it replaces for a like-for-like factory swap\u003c\/li\u003e\n  \u003cli\u003eBacked by Sierra's customer satisfaction warranty\u003c\/li\u003e\n  \u003cli\u003eCompact 3.7 by 1.5 by 1.5 inch body fits tight engine bays\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"nvn-trust\"\u003e\n  \u003ch2\u003eWhy Buy from NVN Marine\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eAuthorized Sierra Marine reseller, full manufacturer warranty\u003c\/li\u003e\n    \u003cli\u003eNMEA member and ABYC certified, advice from real boat techs\u003c\/li\u003e\n    \u003cli\u003eSame-day shipping before 3 PM ET on in-stock items\u003c\/li\u003e\n    \u003cli\u003eNY headquarters and Fort Lauderdale flagship retail store\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"nvn-faq\"\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat does the Sierra TS26621 do?\u003c\/summary\u003e\n    \u003cp\u003eIt's a coolant temperature sender. It threads into the engine and sends a signal to your dash temperature gauge so you can see how hot the engine is running.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat thread size is it?\u003c\/summary\u003e\n    \u003cp\u003e3\/8-18 pipe thread, which fits the standard sender port on most marine gas sterndrive and inboard engines.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat terminal does it use?\u003c\/summary\u003e\n    \u003cp\u003eA single 10-32 stud. Your existing gauge wire and ring terminal land right on it, so there's no rewiring.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat gauge does it work with?\u003c\/summary\u003e\n    \u003cp\u003eIt's matched to a standard 240 degree marine temperature gauge. The sender and gauge have to share the same resistance range or the needle reads wrong.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs it a direct replacement for my factory sender?\u003c\/summary\u003e\n    \u003cp\u003eIn most cases, yes. Sierra builds it to meet or exceed the OEM part, so it's usually a like-for-like swap with no recalibration.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes it come with a wiring harness or gauge?\u003c\/summary\u003e\n    \u003cp\u003eNo. It's the sender only. If you need a harness, a gauge, or a thread adapter for a different port, those are sold separately.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I install it?\u003c\/summary\u003e\n    \u003cp\u003eLet the engine cool, remove the old sender, clean the port threads, add a little thread sealant, and thread the new one in by hand before snugging it with a wrench. Then land your gauge wire on the stud. Don't over-torque it.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I know if my old sender is bad?\u003c\/summary\u003e\n    \u003cp\u003eCommon signs are a gauge that reads cold when the engine's warm, a needle pegged hot when it isn't, or a reading that jumps around. Swapping the sender is a quick, cheap first step.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat's it made of?\u003c\/summary\u003e\n    \u003cp\u003eA brass body built to stand up to marine heat, moisture, and vibration.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs it covered by a warranty?\u003c\/summary\u003e\n    \u003cp\u003eYes, it's backed by Sierra's customer satisfaction warranty.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"nvn-specs\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eTitle\u003c\/th\u003e\n\u003ctd\u003eSierra TS26621 Marine Coolant Temperature Sender\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer\u003c\/th\u003e\n\u003ctd\u003eTeleflex\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003eTS26621\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e023121266216\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSender Type\u003c\/th\u003e\n\u003ctd\u003eCoolant \/ Water Temperature\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eThread Size\u003c\/th\u003e\n\u003ctd\u003e3\/8-18\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eTemperature Range\u003c\/th\u003e\n\u003ctd\u003e240 Degree\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eTerminal Type\u003c\/th\u003e\n\u003ctd\u003e10 To 32 Stud\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eFits\u003c\/th\u003e\n\u003ctd\u003eMarine gas sterndrive and inboard engines\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e0.11 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003ePackage Dimensions (L x W x H)\u003c\/th\u003e\n\u003ctd\u003e3.7 in x 1.5 in x 1.5 in\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What does the Sierra TS26621 do?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's a coolant temperature sender. It threads into the engine and sends a signal to your dash temperature gauge so you can see how hot the engine is running.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What thread size is it?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"3\/8-18 pipe thread, which fits the standard sender port on most marine gas sterndrive and inboard engines.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What terminal does it use?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"A single 10-32 stud. Your existing gauge wire and ring terminal land right on it, so there's no rewiring.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What gauge does it work with?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's matched to a standard 240 degree marine temperature gauge. The sender and gauge have to share the same resistance range or the needle reads wrong.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is it a direct replacement for my factory sender?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"In most cases, yes. Sierra builds it to meet or exceed the OEM part, so it's usually a like-for-like swap with no recalibration.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does it come with a wiring harness or gauge?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No. It's the sender only. If you need a harness, a gauge, or a thread adapter for a different port, those are sold separately.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I install it?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Let the engine cool, remove the old sender, clean the port threads, add a little thread sealant, and thread the new one in by hand before snugging it with a wrench. Then land your gauge wire on the stud. Don't over-torque it.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I know if my old sender is bad?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Common signs are a gauge that reads cold when the engine's warm, a needle pegged hot when it isn't, or a reading that jumps around. Swapping the sender is a quick, cheap first step.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What's it made of?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"A brass body built to stand up to marine heat, moisture, and vibration.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is it covered by a warranty?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes, it's backed by Sierra's customer satisfaction warranty.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Sierra","offers":[{"title":"Default Title","offer_id":45080640159837,"sku":"2010082","price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_9d95a4ea-b160-4b62-84f2-5f4c4a6f3e0d.jpg?v=1789990097","url":"https:\/\/nvnmarine.com\/products\/sierra-ts26621-marine-coolant-temperature-sender-240","provider":"NVN Marine","version":"1.0","type":"link"}