The Chrysler branded engines in the early 38xx bayliners were made by Mitsubishi. The best place for info on these would be the Bayliner owners club forum, there are several owners of 38 series on it and a few with the Mits. The best way to check if it's the gauge or sender is to remove the wire from the sender and ground it with the key switch on. If the gauge pegs when you do this the gauge and wiring are good and the sender has failed. When you ground the wire and nothing happens at the gauge then the gauge or possibly the wiring is at fault.
Sent from my iPad using Trawler Forum
Ron on Northern Lights II
I don't like making plans for the day because the word "premeditated" gets thrown around in the courtroom.