pressure pegs high even with the engine
off! This started late last year but I didn't get to it but now that the boat is back in the water
I need to fix it.
I don't see anything wrong with the wiring
but haven't pulled the harness apart yet to look there (I've learned to start at the harness if the connector is OK).
But since I know that if the sender wire has an open the pressure reads low so the high reading would have to be a short. This is unlikely but the temp gauge was replaced last year and I think the problem started shortly after that so maybe in the back of the gauge the wires have slipped and are grounding from that replacement work (I didn't do it).
I'm going to pull the wire off the sender and see if the gauge then reads low before I get too carried away.
But anyone else have seen a high oil
pressure on a Yanmar
4JH3E? (and it's not the oil or filter as I just changed those and it didn't make any difference and this wouldn't make it peg with the engine