Oil Alarm 95 200 yam 2st

Can anyone help with the following:

3 oil alarm symbols flash after cruising for 5 minutes(same alarm when you pull sensor out of tank on side of motor) soon as motor drops below 1500rpm alarm goes off, replaced inline filters still have problem, main and remote tanks are full all the time, drained main tank and ran through fill process pump working fine alarm goes off at first line then pump at second, someone told me that thermo switches can cause this alarm trigger if faulty? thinking of pulling off oil injection if can't find problem soon, any suggestions much appriciated

[boats.net]

Check the inline fuses on engine, if fuse doesn't fit into fuse holder snugly it will cause all the oil level lights to flash and trigger the alarm.

Have checked the grey and black fuses on side of motor both are a snug fit, is there any others? thanks for the reply

[boats.net]

Test the oil level sensor in engine oil tank.

I have twin motors so i swaped oil systems(sensors, tanks etc...) but still have problem on same motor!