I agree with Quick Silver, dimming dash lights and gauges reacting to dash lights on is clear indication of poor ground. LED dash lights are probably more sensitive to low voltage than filament bulbs. These year GM cars are notorious for bad dash grounds. I'd drill a 1/8 hole (carefully into the side of the cluster case (the steel part) and put in a good serrated ground wire connection direct to a ground smooth to bare steel area on the body shell itself. The factory grounds are a joke, sheet nuts tightened on plastic studs and screws into plastic housings, failure prone is a serious understatement especially when that plastic is 51 years old.
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My Break Away Squad
1969 Fbird (Base, 350 & Sprint Cvt’s - 400HO & TA Hardtops)
1969 LeMans (2dr & 4dr Hardtop and a Cvt)
1969 LeMans Safari 2 seat Wagon
1969 GTO (2 Cvt, 2 Hardtops & Judge Hardtop)
1969 Catalina (3 Cvt’s & a 2dr hardtop)
1969 Ventura 2 Seat Wagon
1969 Executive 4dr Sedan
1969 Bonnie Cvt
1969 Bonnie 3 Seat Wagon (2 of them)
1969 Bonnie Brougham (4dr Hardtop & Cvt)
1969 Grand Prix SJ (2 of them)
1969 2+2 2dr Hardtop (Canadian model)
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