My gauge has been pitching fits recently. Goes to full for a while. Returns to where it is supposed to be for a while, back and forth. I suspect a bad ground, but I thought I had taken great care to make sure I would not have the problem I am currently having.
Good luck on you repair!
68' Firebird 400 convertible, numbers matching, solar red w/ deluxe parchment interior. 66' Pontiac Ventura Hardtop 66' Pontiac Catalina Convertible
