{"product_id":"mercury-adapter-harness-84-8m0137199","title":"Mercury – Adapter Harness | Racing 350 SCI to 400R Fuel\/Paddle\/Vessel Interface | 84-8M0137199","description":"\u003cp data-start=\"0\" data-end=\"98\"\u003e\u003cstrong data-start=\"0\" data-end=\"98\"\u003eMercury – Adapter Harness | Racing 350 SCI to 400R Fuel\/Paddle\/Vessel Interface | 84-8M0137199\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr data-start=\"100\" data-end=\"103\"\u003e\n\u003cp data-start=\"105\" data-end=\"117\"\u003e\u003cstrong data-start=\"105\" data-end=\"117\"\u003eOverview\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"119\" data-end=\"548\"\u003eRepowering from a 350 SCI to a 400R can leave you with harnesses that don’t quite match, especially around the fuel-level, paddle-wheel, and vessel-sensor connections. The Mercury 84-8M0137199 Adapter Harness makes that transition clean and straightforward. It bridges the older 350 SCI harness layout to the newer 400R interface so the sensors you already have can continue talking to the engine without rewiring the whole boat.\u003c\/p\u003e\n\u003chr data-start=\"550\" data-end=\"553\"\u003e\n\u003cp data-start=\"555\" data-end=\"571\"\u003e\u003cstrong data-start=\"555\" data-end=\"571\"\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"575\" data-end=\"680\"\u003e\n\u003cstrong data-start=\"575\" data-end=\"600\"\u003eSCI-to-400R Adapter –\u003c\/strong\u003e Aligns the 350 SCI harness layout with the 400R Fuel\/Paddle\/Vessel interface.\u003c\/li\u003e\n\u003cli data-start=\"683\" data-end=\"775\"\u003e\n\u003cstrong data-start=\"683\" data-end=\"713\"\u003eFuel-Level Compatibility –\u003c\/strong\u003e Ensures tank sender information reaches the 400R correctly.\u003c\/li\u003e\n\u003cli data-start=\"778\" data-end=\"854\"\u003e\n\u003cstrong data-start=\"778\" data-end=\"804\"\u003ePaddle-Wheel Support –\u003c\/strong\u003e Carries paddle-wheel speed input when equipped.\u003c\/li\u003e\n\u003cli data-start=\"857\" data-end=\"960\"\u003e\n\u003cstrong data-start=\"857\" data-end=\"881\"\u003eVessel Sensor Link –\u003c\/strong\u003e Allows existing vessel-sensor data to integrate with the newer 400R rigging.\u003c\/li\u003e\n\u003cli data-start=\"963\" data-end=\"1054\"\u003e\n\u003cstrong data-start=\"963\" data-end=\"984\"\u003ePlug-In OEM Fit –\u003c\/strong\u003e Factory connectors provide a clean, direct, no-splice installation.\u003c\/li\u003e\n\u003cli data-start=\"1057\" data-end=\"1145\"\u003e\n\u003cstrong data-start=\"1057\" data-end=\"1085\"\u003eRigging Simplification –\u003c\/strong\u003e Eliminates guesswork during repowers or harness upgrades.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1147\" data-end=\"1150\"\u003e\n\u003cp data-start=\"1152\" data-end=\"1169\"\u003e\u003cstrong data-start=\"1152\" data-end=\"1169\"\u003eCompatibility\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"1173\" data-end=\"1197\"\u003eMercury Racing 350 SCI\u003c\/li\u003e\n\u003cli data-start=\"1200\" data-end=\"1221\"\u003eMercury Racing 400R\u003c\/li\u003e\n\u003cli data-start=\"1224\" data-end=\"1283\"\u003eFuel, paddle-wheel, and vessel-sensor harness connections\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1285\" data-end=\"1288\"\u003e\n\u003cp data-start=\"1290\" data-end=\"1326\"\u003e\u003cstrong data-start=\"1290\" data-end=\"1326\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1328\" data-end=\"1704\"\u003eThis harness smooths out one of the trickiest parts of jumping from a 350 SCI to a 400R—getting all the sensors to communicate the way they should. It keeps your existing fuel-level, paddle-wheel, and vessel-sensor wiring in play, saving time and avoiding unnecessary modifications. Once installed, the system behaves naturally, and the helm displays get the data they expect.\u003c\/p\u003e\n\u003chr data-start=\"1706\" data-end=\"1709\"\u003e\n\u003cp data-start=\"1711\" data-end=\"1726\"\u003e\u003cstrong data-start=\"1711\" data-end=\"1726\"\u003eWhy Buy OEM\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1728\" data-end=\"2063\"\u003eRacing engines depend on precise sensor communication, and Mercury’s OEM connectors are built for the exact pin alignment and shielding these systems require. Aftermarket adapters often cause noise in the signal or fail under vibration. The factory harness fits right, holds tight, and keeps your data steady at every throttle setting.\u003c\/p\u003e\n\u003chr data-start=\"2065\" data-end=\"2068\"\u003e\n\u003cp data-start=\"2070\" data-end=\"2077\"\u003e\u003cstrong data-start=\"2070\" data-end=\"2077\"\u003eFAQ\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"2079\" data-end=\"2238\"\u003e\u003cstrong data-start=\"2079\" data-end=\"2115\"\u003eQ1: When do I need this adapter?\u003c\/strong\u003e\u003cbr data-start=\"2115\" data-end=\"2118\"\u003eWhen upgrading from a 350 SCI to a 400R and you want to retain the existing fuel, paddle-wheel, or vessel-sensor wiring.\u003c\/p\u003e\n\u003cp data-start=\"2240\" data-end=\"2356\"\u003e\u003cstrong data-start=\"2240\" data-end=\"2287\"\u003eQ2: Does this harness add any new features?\u003c\/strong\u003e\u003cbr data-start=\"2287\" data-end=\"2290\"\u003eNo. It simply adapts your current sensors to the 400R’s interface.\u003c\/p\u003e\n\u003cp data-start=\"2358\" data-end=\"2444\"\u003e\u003cstrong data-start=\"2358\" data-end=\"2400\"\u003eQ3: Will it affect engine performance?\u003c\/strong\u003e\u003cbr data-start=\"2400\" data-end=\"2403\"\u003eNo. It only manages sensor communication.\u003c\/p\u003e\n\u003cp data-start=\"2446\" data-end=\"2541\"\u003e\u003cstrong data-start=\"2446\" data-end=\"2482\"\u003eQ4: Is installation complicated?\u003c\/strong\u003e\u003cbr data-start=\"2482\" data-end=\"2485\"\u003eNo. It’s a plug-in adapter using OEM Mercury connectors.\u003c\/p\u003e\n\u003cp data-start=\"2543\" data-end=\"2668\"\u003e\u003cstrong data-start=\"2543\" data-end=\"2579\"\u003eQ5: Can it withstand racing use?\u003c\/strong\u003e\u003cbr data-start=\"2579\" data-end=\"2582\"\u003eYes. It’s made for the vibration, heat, and movement typical of high-performance rigs.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46935999512867,"sku":"84-8M0137199","price":35.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV722318.jpg?v=1720534422","url":"https:\/\/partsvu.com\/en-au\/products\/mercury-adapter-harness-84-8m0137199","provider":"PartsVu","version":"1.0","type":"link"}