Thanks. I'll re-examine the connections.

The ground connection wire goes to one of the sending unit screws but that seems sort of inadequate considering the sending unit rests on a rubber seal so the only connection to the tank is the few threads of that screw in contact with the tank.

The tank rests on rubber pads in its cradle and the straps are cushioned where they contact the tank.

I'll run a dedicated ground wire from a known good ground to the same screw on the the gauge wire is grounded to on the sending unit.

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)