Thank you, I’m going to need to read through this a few times. The impeller and thermostat were changed prior to last season. I’m only getting the alarm at around 4500-4800 rpm after running a bit. It’s a solid alarm, not the on/off low oil alarm, I had just added oil prior to taking the boat...
Took the boat out yesterday, first trip of the year. Went about 2-3 miles and got a long steady beep alarm. Shut it down, started it up a minute or so later, went a few more minutes same thing. Turned around and headed back, did stop for lunch on the way.
According to google this is likely...