88 prostar oil pressure

[90pony]

I just bought a 88 prostar 190 (351w). I changed the oil before taking it to the lake. After the engine warms up and runs 10 munutes the oil pressure drops while the engine idles to around 10 pounds and the warning buzzer goes off under the dash. While the boat is running at any speed the oil is fine and no buzzer.Anyone know anything about this?

[Jimmauburn]

How many quarts of oil did you put in the boat when you changed the oil ?? I had an 88 and had to replace the oil pump twice ??

[87MCProstar]

I have an 87 and the oil pressure is steady all the time, right after starting...when my boat feels like starting...