Fiddled around with the car a bit last night and really made sure that the ground at the post by the radio and hvac was secure and tight and that really helped. I had 100% illumination from the gauges and didn't lose the gas gauge either last night.
That being said I'm still gonna crawl under this thing and add some more grounding to the cluster because it's pretty clear that lone ground isn't really sufficient and it appears to want to loosen up over time.
I really appreciate everyone's help with this!
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-Jason
1969 Pontiac Firebird
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