{"product_id":"shift-assist-module-harness-for-v-8-sterndrives-replaces-omc-987739-fits-5-0-5-8-ford-1986-1990-sierra-18-5890-1","title":"Sierra Shift Assist Module \u0026 Harness 18-5890-1, Replaces OMC 987740\/985902, Fits OMC 2.3, 3.0, 4.3 (1986-90) \u0026 2.5 (1986) Sterndrive","description":"\u003cp\u003eThe Sierra 18-5890-1 Shift Assist Module \u0026amp; Harness is a direct-fit replacement electrical module used to restore smooth, reliable shift operation on OMC sterndrive engines. The kit includes the shift assist module along with its wiring harness, allowing for a straightforward swap in place of the original equipment module without splicing in a separate harness. The housing is constructed of aluminum with a white finish, matching the original module's build for durable, long-term service in the marine engine compartment.\u003c\/p\u003e\u003cp\u003eThis module is engineered to meet or exceed the performance of the original equipment part it replaces, making it a dependable choice for engine owners who need to restore correct shift function. It is built for OMC sterndrive engines in the 2.3, 3.0, and 4.3 displacement range (1986-90) as well as the 2.5 displacement (1986), covering the shift assist electronics for these specific engine years.\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 18-5890-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Shift Assist Module \u0026amp; Harness\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 987740, 985902\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e OMC 2.3, 3.0, 4.3 (1986-90) \u0026amp; 2.5 (1986)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 6 x 1.5 x 6 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.49 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282392413\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOMC 2.3, 3.0, 4.3 sterndrive engines (1986-90)\u003c\/li\u003e\n\u003cli\u003eOMC 2.5 sterndrive engine (1986)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e987740\u003c\/li\u003e\n\u003cli\u003e985902\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-5890-1 replace?\u003c\/strong\u003e The Sierra 18-5890-1 shift assist module and harness replaces OMC part numbers 987740 and 985902.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich engines does this shift assist module fit?\u003c\/strong\u003e It fits OMC sterndrive engines in the 2.3, 3.0, and 4.3 range built in 1986-90, as well as the 2.5 engine built in 1986.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-5890-1 include the wiring harness?\u003c\/strong\u003e Yes, the kit includes both the shift assist module and its matching wiring harness for a complete swap.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the module housing made of?\u003c\/strong\u003e The Sierra 18-5890-1 module has an aluminum housing finished in white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-5890-1 weigh?\u003c\/strong\u003e The Sierra 18-5890-1 shift assist module and harness weighs 0.49 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the shift assist module?\u003c\/strong\u003e The module measures 6 x 1.5 x 6 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e It is a genuine Sierra part, manufactured to meet or exceed the performance of the original OMC shift assist module it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill part number 987739 or the Ford 5.0\/5.8 sterndrive shift module also work in place of this one?\u003c\/strong\u003e No, that is a different part number and engine application; the Sierra 18-5890-1 is specific to OMC 2.3, 3.0, 4.3 (1986-90) and 2.5 (1986) sterndrive engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-5890-1?\u003c\/strong\u003e The UPC for the Sierra Shift Assist Module \u0026amp; Harness (18-5890-1) is 808282392413.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this module be installed without additional wiring modifications?\u003c\/strong\u003e Since the 18-5890-1 kit includes the correct matching harness, it is designed to install in place of the original module and harness without needing to splice in a separate harness.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-5890-1 come as a complete kit or just the module?\u003c\/strong\u003e It is sold as a complete kit consisting of the shift assist module and its wiring harness.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988340879579,"sku":"SIE-18-5890-1","price":123.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-5890_lg__75319.1558130647.500.750.jpg?v=1785188827","url":"https:\/\/www.goodvibesmarina.com\/products\/shift-assist-module-harness-for-v-8-sterndrives-replaces-omc-987739-fits-5-0-5-8-ford-1986-1990-sierra-18-5890-1","provider":"Good Vibes Marina","version":"1.0","type":"link"}