{"product_id":"marine-engine-temperature-sender-1-2-14-npt-240-ohm-range-replaces-mercruiser-97258a1-omc-171960-sierra-18-5898","title":"Sierra 18-5898 Temperature Sender, 1\/2-14 NPT Thread, Replaces Mercury 97258A1","description":"\u003cp\u003eThe Sierra 18-5898 Temperature Sender is a replacement engine temperature sending unit built with a 1\/2 inch-14 NPT thread and a 10-32 stud terminal for connecting to the gauge wiring harness. It is designed for a 240 degree Fahrenheit temperature range, matching the sending units used on many Mercury Marine and other marine engine applications. Sierra engineers this sender to meet or exceed the performance of the original equipment part it replaces, giving boat owners a reliable, direct-fit option when the factory sender fails or reads inaccurately.\u003c\/p\u003e\u003cp\u003eThis sender threads directly into the engine block or manifold temperature port and relays coolant or engine temperature data to the helm gauge, helping monitor engine health and prevent overheating damage. It is cross-referenced to numbers used by Crusader, Mallory, Medallion, Mercruiser, OMC, Stewart Warner, and Veethree Seastar, making it a common replacement across a range of inboard and stern drive engines that use this thread size and terminal configuration.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-5898\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size:\u003c\/strong\u003e 1\/2 inch -14 NPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal Type:\u003c\/strong\u003e 10-32 stud\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature Range:\u003c\/strong\u003e 240 degrees Fahrenheit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.15 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits engines and applications using a 1\/2 inch-14 NPT temperature sender port with a 10-32 stud terminal, including engines originally equipped with the cross-referenced OEM senders listed below.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCrusader 700427\u003c\/li\u003e\n\u003cli\u003eMallory 9-42401\u003c\/li\u003e\n\u003cli\u003eMedallion A-2618-4\u003c\/li\u003e\n\u003cli\u003eMercruiser 34625\u003c\/li\u003e\n\u003cli\u003eMercury Marine 97258\u003c\/li\u003e\n\u003cli\u003eMercury Marine 97258A1\u003c\/li\u003e\n\u003cli\u003eFI6900152\u003c\/li\u003e\n\u003cli\u003eFI6900198\u003c\/li\u003e\n\u003cli\u003eOMC 171960\u003c\/li\u003e\n\u003cli\u003eStewart Warner 362BB-D\u003c\/li\u003e\n\u003cli\u003eVeethree Seastar 52320S017\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat thread size does the Sierra 18-5898 temperature sender use?\u003c\/strong\u003e It uses a 1\/2 inch-14 NPT thread, which is the same thread size as the original sending unit it is designed to replace.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat temperature range is the 18-5898 sender rated for?\u003c\/strong\u003e The Sierra 18-5898 is designed for a 240 degree Fahrenheit temperature range, matching common marine engine temperature gauge setups.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat kind of terminal connection does this sender have?\u003c\/strong\u003e A 10-32 stud terminal is used on the 18-5898, which connects to the wiring lead running to the temperature gauge at the helm.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the Sierra 18-5898 work as a direct replacement for a Mercury 97258A1 sender?\u003c\/strong\u003e Yes, the 18-5898 is cross-referenced to replace Mercury Marine 97258 and 97258A1 temperature senders.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-5898 compatible with OMC engines?\u003c\/strong\u003e Yes, this sender is cross-referenced to OMC part number 171960 for both inboard and stern drive applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-5898 replace Crusader or Mallory senders?\u003c\/strong\u003e Yes, it cross-references to Crusader 700427 and Mallory 9-42401, along with several other OEM equivalents.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-5898 temperature sender weigh?\u003c\/strong\u003e The Sierra 18-5898 weighs 0.15 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-5898 an OEM or aftermarket part?\u003c\/strong\u003e It is an aftermarket Sierra replacement sender engineered to meet or exceed the performance of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-5898?\u003c\/strong\u003e The order includes one Sierra 18-5898 temperature sending unit with its 10-32 stud terminal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this sender fit Stewart Warner and Veethree Seastar gauge systems?\u003c\/strong\u003e Yes, the 18-5898 cross-references to Stewart Warner 362BB-D and Veethree Seastar 52320S017 sending units.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does a temperature sender like the 18-5898 do?\u003c\/strong\u003e It threads into the engine and sends a temperature signal to the helm gauge, allowing the operator to monitor engine temperature and catch overheating before it causes damage.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988342255835,"sku":"SIE-18-5898","price":22.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-5898_lg__57960.1558127957.500.750.jpg?v=1785188093","url":"https:\/\/www.goodvibesmarina.com\/products\/marine-engine-temperature-sender-1-2-14-npt-240-ohm-range-replaces-mercruiser-97258a1-omc-171960-sierra-18-5898","provider":"Good Vibes Marina","version":"1.0","type":"link"}