Re: trim guage
Bman, I had the exact problem with my 87 force 125 last month. I turned the ignition switch on, took a light tester, went to the sending unit on back of boat, both wires showed hot. A mechanic said I had a faulty ground. Went back to the gauge, installed a ground wire to the "G" post, connected the other end to a known grd under the dash. Gauge works perfect now. Hope this helps you.