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You dont have all the nuts off.... 1 under torque tab 2 under AV plate above prop 2 on sides 1 on front

Could be broken solder joints in PDP....

Just replace it...

You are missing some fasteners..should have 5 nuts and 1 bolt on the bench for it to come off.

First time this happened? Boat new to you? Picture of engine mounting height?

It being #1 and #4 not moving I would look at ignition system reeeealy good

I doubt its the valve and its doing it job. The likely culprit is the pressure fitting on engine block that supplys air pressure to boat oil tank. It has a small hole that bleeds pressure off when engine is at rest. if oil tank overpressures the check valve will open and the result is what you...

Pressure check valve that supply air to oil tank not bleeding off. In 40 years only seen 1 of these bad..

If thats the cheap chicom amazon one, it will last about a week before check valves swell up and fail

Make sure the cooling tube is not stopped up to EMM

Gear ratio is different between a V6 and V4 looper but can share the same big diameter gearcase. Put the port motor in gear and rotate the flywheel 1 full turn and count the rotations of prop.

Then this thing would make would either mince it or braid it into rope!!!

Missing the indicator tube cap #5031165 and maybe the tube that screw in.

Gauge attaches to fitting in adapter plate . As posted WP is suspect

Water pressure is low at WOT and this will effect the t-stat/poppet seating. The t-stat is not used at WOT as its bypassed by water control valve.

Turn the switch 180°

Test it in a barrel to see if alarm goes off. If oil system was not properly done it could be low oil alarm on engine oil tank. You cannot just unplug the oil pump on boat side tank to bypass.

A good marine lower gear oil...no automotive stuff. Wally world sells the Supertech and Quicksilver brands

Could be dropping a cylinder...ignition or injector issue

Hot or low oil