I had the same problem and it ended up being a broken purple wire in the throttle handle going to the trim switch. Had to remove the throttle handle to solder the wire back together. Moving the throttle flexes the wires and they can break over time.
@R186, I'd check wiring (ground) connections at the throttle, then I'd go after the sending units. BTW - I assume the trim and trailer tilt circuits are on the same fuse...... because if they weren't.....
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