[motornut]

I had read about the bouncy gas gauge
heard it was because of aftermarket "Spectra" parts
I could read that name on my tank

assumed this was why my 78 gas gauge bounced with idiots
I added a ground behind the cluster where they go too one,didn't help
i bought and changed to a tach/gauge setup
had to rewire it and had to add a seperate ground for the gauge
and the bounce went away....

this past summer my 79 tank/sender rusted out
replaced it with "spectra" parts
as my auto parts guy said he's never heard of this prob
no bounce

speedo make sure it's in tight