Have owned the boat for 12 + years trim guage never worked.
Got a new instrument panel a few years later and didn't work, investigated sender wiring and found them all broken (common problem)
picked up a cheap knock off sender this year and while working through the install I was testing the new sender before fishing new wires, can't get the trim guage to even budge, tried jumping the wires, manually turning sender, etc. Ohm meter on sender indicates its working.
So I am down to the wiring between the plug from sender cable to the instrument panel, I can't trace sucessfully the wiring from the harness, though I haven't tried a continuity tester yet. I am beginning to think the trim guage itself is inop though it seems like the least likely culprit as its only a few years old compared to the rest of the boat. I can't make heads or tails out of the schematic and without removing the guage from the bezel is there a way to jumper the guage itself to see if it will even move? sorry for the poorly written question, looking for further troubleshooting. I have been without for 10 years so its not a big deal just one of those things would be nice to work if I could figure it out....can't get image to host from flickr but below is link to back of trim guage
https://flic.kr/p/2myVCXU
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Jon Miller
1998 four Winns Horizon H200
Volvo Penta 4.3 GL
Newtown, CT
untitled-545 by
millerjont, on Flickr