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Yeah, I don't know why one would go haywire and the others be stable. But that's what it is, right?
So we are guessing a little here, but I would try disconnecting the alternator in case the rectifier is faulty. And maybe try a radio noise suppressor capacitor between the gauge fuse and ground to see if that helps. Just hook it up with clip wires to see what happens.
I wish I was familar with your ignition system but I am suspicious of that possibility.
He has three terminals. I wonder if the ground to the gauge is not working right. Like you guys said before, this could be a ground problem from the engine to the body, or a ground problem from the cluster panel to the body, or both. New dash paint and grounds don't work well together(been there, done that).
Well, I got a chance to look into this problem today.
After spending 20-30 minutes going over all the connections and checking resistance between areas of the chassis, I figured the smartest thing to do was start with the simplest thing first.
I ran a #10 jumper wire directly from neg bat terminal to the gauge ground lead and wouldn't you know it, PROBLEM SOLVED!!
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