Hot start, low oil pressure... sender? pump?

[hollant]

2006 PCM 330 with 600 hours, all of the sudden the oil pressure takes 30 seconds or so to get to 10 psi on the gauge and extinguish the low oil pressure warning.

Oil level normal, running Mobile 1 15w50.

Thoughts?

[jkallen21]

So, the 330 manual shows both a sender and a switch. The sender controls the gauge and the switch controls the alarm. So you’ve got two different sensors saying something is wrong. However, they’re both plugged into the same hole via a small TEE bar.
You need a manual oil pressure gauge plugged in where the TEE is now. You can get one at Harbor Freight cheap or maybe Autozone let’s you borrow one (not sure). This will tell you the actual pressure for certain.
If you remove the TEE and start the boat, the alarm won’t stop (you can silence it for 60 seconds by pressing the up and down arrows in the dash). You could try plugging it in where the sender is today and see what it reads as well.
Good luck!