Beware of grounds that disappear when you reinstall fuel gauges. That square metal strip between the two screw posts on the gauge doesn't touch all the time when you put the gauge back in the cluster. The fuel sender would not register again. the cluster was grounded because the dash bulbs worked. I had to drill a small hole in the fiber pad that isolates the 2 posts from the housing and run a small gauge wire into the back of the cluster and pinch it between the grounding strip and the housing when I tightened the 2 studs. No I have a ground that won't come and go. Just wanted to let you guys know how frustrating chasing a ghostly ground can be. I did have the gauge centered on the two tabs like it's supposed to be.
Sharon