Two grounds involved. One on the back of the cluster, just a regular sheet metal screw - that has a thin metal rod with a loops on the end that runs to the center top instrument cluster screw on the dashboard. Don't see the thin rod in your photo.
You can compensate with a piece of wire to one of the rear cluster screws grounded to the car.
Then there is the ground wire for the fuel sender itself under the car in front of the gas tank where the passenger side gas tank strap attaches to the trunk floor.
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI
