I installed a water pressure gauge in my v6 because I have had a alarm on overheating issue. Upon testing on land w/ears on the pressure never exceeds 6 psi even though i brought rpms to 3000 . I figured it should be at least 10-15 psi. I originally tapped into the hose between cylinder heads but then installed at base just past 90 degree fitting. I also installed a new waterpump impeller housing and seals. The boat will run to 1500 rpms without the alarm on, the minute I throttle past temp rises alarm goes on. After waiting only 20-40 seconds start back up alarm off.Thank you for any help you can offer.