hello my friends johnson ocean pro 150 1995, the buzzer went on right away when key was turned it started but would rev high took out the thermos they were sticking so replaced and it seemed to fix the problem we boated all day but at the end of the day the buzzer went off again its not overheating and there is lots of oil in tank its a constant buzzer not beeping or intermittent is it a faulty sensor anyone had this issue ???