buzzer alarm

[champscycles]

I have a 81 dt 115 I installed new impeller and it pumps a strong stream out the water hole the motor runs great but the alarm goes off when im out driving. Ill bewide open and the alarm will go off than it will shut off nothing changes I just have this anoying sound any help or suggestions

[boats.net]

Could be oil level alarm or overheat, check oil system.

[champscycles]

Oil sensor replaced, the motor smokes prettygood on startup and the oil injection seems to work I just pulled the temp sensor off the head and their was lots of corosion where it sets, and also where the positive wire plugs in. I replaced it with another. I just need to test it out hope I dont get any alarms