Originally Posted by Bluefish17
I have a Cummins qsb 5.9 425 hp single engine.
Normally the oil psi is 51-52. I'm on an overnight trip and noticed yesterday the oil psi was 66. No alarms or error indicators. Last changed oil and filter last fall at layup. Boat ran fine but is this something I should worry about and look into? I have a 4 he return trip today.
Could be the sender or the gauge. Have someone put a hand gauge directly on the engine to get true reading.
I had a gauge reading 15 psi high on my Cummins 370B. It was the sender