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I just Re powered my 1963 13' Boston whaler with a used 1995 40 hp Evinrude.. 2 stroke. oil injection.
Model # E4OEEOD. Check everything(compression , etc,..) and gave quick tune up (Plugs, lower oil unit,) before my first start in the driveway. Started in driveway and ran for about 10 minutes in my driveway(water pumping great.. everything sounded and ran great ( no horn except when first turn key on for short second). Took to lake for first test run today. When I turned key on the horn starts steady beep(even before starting engine), started engine runs perfect.. still steady beep. . I pump the oil ball and check for any leaks. I take off oil hose and pump oil ball, oil comes out easily and steady. turn key and run engine again... Still steady beep. turned off.. unplugged wires to the oil tank...(tan /black wire connector on starter side of engine).. beep stops. Starts and runs great and yet when i plug in wire to oil tank steady non- stop beep. I ran around the lake at 25 mph for about 15 minutes.. Still runs great and yet as long as the wire is plugged in to the oil tank the horn is steady beep.

Help? what should i test. please help me make sense of this.. obvious no over heating issue since it beeps steady before i even started. And the engine ran well with no signs of overheating at all. I thought no oil / low oil is a beep, beep, beep not steady. . Oil tank is 3/4 full.