{"product_id":"881879t26-water-pressure-sensor-for-mercury-jlm-marine","title":"881879T26 Water Pressure Sensor for Mercury | JLM Marine","description":"\u003ch2\u003eWater Pressure Sensor – Fits Mercury 135–400 HP Outboards | 881879T26\u003c\/h2\u003e\n\n\u003cp\u003eThis water pressure sensor is designed for Mercury outboard engines ranging from 135 HP to 400 HP. It provides accurate pressure readings to monitor your engine's cooling system performance and prevent overheating damage. Engineered as a direct replacement, this sensor integrates seamlessly with your existing setup.\u003c\/p\u003e\n\n\u003cp\u003eThis aftermarket sensor directly replaces Mercury Marine part numbers \u003cstrong\u003e881879A19\u003c\/strong\u003e, \u003cstrong\u003e881879A20\u003c\/strong\u003e, \u003cstrong\u003e881879T26\u003c\/strong\u003e, and \u003cstrong\u003e8M6000639\u003c\/strong\u003e, offering reliable performance at a competitive price point.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eCompatible with Mercury 135 HP through 400 HP outboard engines\u003c\/li\u003e\n  \u003cli\u003eDirect-fit replacement for multiple OEM part numbers\u003c\/li\u003e\n  \u003cli\u003eMonitors water pressure in engine cooling system\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket sources:\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eBrand\u003c\/th\u003e\n      \u003cth\u003ePart Number\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMercury Marine\u003c\/td\u003e\n      \u003ctd\u003e881879A19\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMercury Marine\u003c\/td\u003e\n      \u003ctd\u003e881879A20\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMercury Marine\u003c\/td\u003e\n      \u003ctd\u003e881879T26\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMercury Marine\u003c\/td\u003e\n      \u003ctd\u003e8M6000639\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\n\u003cp\u003eConfirm your engine model\/year in the table below. For Mercury owners, here's a guide to help you identify your engine's serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/mercury-outboard-serial-number-guide\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Serial Number Guide\u003c\/a\u003e. You can also review exploded diagrams to verify part numbers: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/diagrams\/mercury-parts-catalog\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Parts Diagrams \u0026amp; Catalog\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eBrand\u003c\/th\u003e\n      \u003cth\u003eRated HP\u003c\/th\u003e\n      \u003cth\u003eOEM Part No.\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMercury Marine\u003c\/td\u003e\n      \u003ctd\u003e135 HP\u003c\/td\u003e\n      \u003ctd\u003e881879T26\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMercury Marine\u003c\/td\u003e\n      \u003ctd\u003e150 HP\u003c\/td\u003e\n      \u003ctd\u003e881879T26\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMercury Marine\u003c\/td\u003e\n      \u003ctd\u003e175 HP\u003c\/td\u003e\n      \u003ctd\u003e881879T26\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMercury Marine\u003c\/td\u003e\n      \u003ctd\u003e200 HP\u003c\/td\u003e\n      \u003ctd\u003e881879T26\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMercury Marine\u003c\/td\u003e\n      \u003ctd\u003e225 HP\u003c\/td\u003e\n      \u003ctd\u003e881879T26\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMercury Marine\u003c\/td\u003e\n      \u003ctd\u003e250 HP\u003c\/td\u003e\n      \u003ctd\u003e881879T26\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMercury Marine\u003c\/td\u003e\n      \u003ctd\u003e275 HP\u003c\/td\u003e\n      \u003ctd\u003e881879T26\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMercury Marine\u003c\/td\u003e\n      \u003ctd\u003e300 HP\u003c\/td\u003e\n      \u003ctd\u003e881879T26\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMercury Marine\u003c\/td\u003e\n      \u003ctd\u003e350 HP\u003c\/td\u003e\n      \u003ctd\u003e881879T26\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eMercury Marine\u003c\/td\u003e\n      \u003ctd\u003e400 HP\u003c\/td\u003e\n      \u003ctd\u003e881879T26\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eSpecification\u003c\/th\u003e\n      \u003cth\u003eValue\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003ePart Type\u003c\/td\u003e\n      \u003ctd\u003eWater Pressure Sensor\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eApplication\u003c\/td\u003e\n      \u003ctd\u003eMercury Outboard Engines\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eCompatible HP Range\u003c\/td\u003e\n      \u003ctd\u003e135 HP – 400 HP\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eOEM Part Numbers Replaced\u003c\/td\u003e\n      \u003ctd\u003e881879A19, 881879A20, 881879T26, 8M6000639\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\n\u003cp\u003eYour package includes:\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e1 × Water Pressure Sensor\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDisconnect the battery\u003c\/strong\u003e to ensure safe working conditions before beginning any electrical work on your outboard.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLocate the existing water pressure sensor\u003c\/strong\u003e on your Mercury engine. It is typically mounted on the cylinder head or cooling system housing.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDisconnect the electrical connector\u003c\/strong\u003e from the old sensor by gently pressing the release tab and pulling it free.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRemove the old sensor\u003c\/strong\u003e by turning it counterclockwise with an appropriate wrench or socket. Be prepared for minor water spillage.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClean the mounting threads\u003c\/strong\u003e on the engine block to remove any debris, old sealant, or corrosion.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApply marine-grade thread sealant\u003c\/strong\u003e to the threads of the new sensor if required by your engine's service manual.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInstall the new water pressure sensor\u003c\/strong\u003e by threading it clockwise into the mounting hole and tightening to the manufacturer's specified torque.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReconnect the electrical connector\u003c\/strong\u003e to the new sensor, ensuring it clicks securely into place.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReconnect the battery\u003c\/strong\u003e and start the engine to verify proper sensor operation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCheck your gauge or display\u003c\/strong\u003e to confirm that water pressure readings appear normal during engine operation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInspect for leaks\u003c\/strong\u003e around the sensor after the engine has warmed up and the cooling system is under full pressure.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this sensor fits my Mercury engine?\u003c\/strong\u003e\u003cbr\u003e\nA: Verify your engine's horsepower rating falls within the 135–400 HP range listed in the compatibility table. Cross-reference your original part number (881879A19, 881879A20, 881879T26, or 8M6000639) with the part number cross-reference table above.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs that my water pressure sensor has failed?\u003c\/strong\u003e\u003cbr\u003e\nA: Common symptoms include inaccurate or erratic pressure readings on your gauge, no pressure reading at all, or warning alarms\/lights indicating low water pressure even when the cooling system is functioning properly. If your engine is overheating despite adequate water flow, a faulty sensor may also be the cause.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace the water pressure sensor?\u003c\/strong\u003e\u003cbr\u003e\nA: Water pressure sensors typically do not require scheduled replacement and should last many years under normal conditions. Replace the sensor if you experience faulty readings, corrosion damage, or as part of troubleshooting cooling system issues.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I install this sensor myself or do I need a mechanic?\u003c\/strong\u003e\u003cbr\u003e\nA: If you are comfortable with basic outboard maintenance and have the proper tools, you can install this sensor yourself by following the installation guide. However, professional installation is recommended if you are unfamiliar with electrical connections or engine cooling systems.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is this an OEM part or an aftermarket replacement?\u003c\/strong\u003e\u003cbr\u003e\nA: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003e\nA: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003e\nA: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n  \u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":51981004702009,"sku":"23PS380","price":81.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/12_f9bc5c14-24e0-4dbe-a593-bb94b3d03c86.jpg?v=1772414364","url":"https:\/\/jlmmarine.com\/products\/881879t26-water-pressure-sensor-for-mercury-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}