Need to isolate it out. I would unplug the oil injection warning module and see if it stops going off. If that doesn't do it, unhook the overheat sensor(s). Just have to work your way down the chain until you find the problem. On an older engine, it could also easily be corrosion making continuity occur where it shouldn't.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
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