My guess too would be any grounds.. I had wierd happenings when I neglected to replace the center mounting screw right above the steering wheel. It is a ground for the instrument panel, sometimes it would work when it wanted to , other times it did not. Drove me crazy.. replaced the screw and all was fine... Good luck
Followed your advice and ran a ground wire from the back of the instrument cluster to the firewall. This solved the problem on the gas gauge. But, now I have an issue with the turn signals. They are not working. Any ideas?
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