Low oil Warning

I have a 2001 ox66. The oil warning light always flashes half tank no matter how much oilis in the tank. Tryed switching the sensor in the tank but got the same results so i put my old one back. Is my guage broke or is there somewhere else i should look? Thanks

[boats.net]

Check that the gauge harness between engine and tach is connected and no corroded connections. If harness is disconnected or if oil level sensor in boat oil tank is bad gauge will show low oil.