I have a 1988 Mercury XR4 150. I've got her running great - but there's one last problem I can't get figured out. When I get past about 1/4 throttle, my Oil Injection Alarm starts beep - beep - beep, and won't stop until I slow the boat down to about 1/4 throttle again. It's not a constant beep, so it's not overheating. It's definitely the oil. I've replaced the sending unit, made sure that my reserve tank was full to the top, and checked both oil tanks and caps for cracks or leaks. I've also pulled the oil pump off, and inspected it for problems. Everything looks good. What's got me buffaloed is that it only starts beeping at the higher RPM's. Anyone out there have any suggestions? Thanks for the help. AC.