My speedo wasn't working when I gotr it. It turned out there was no cable inside the sheath.

I installed a new cable and it worked for 5000 miles before the speedo head itself broke, Rebuilt it, no problems now.

Where is the fuel needle pointing? Always full is usually a ground issue. Always empty is usually an issue with the wiring between the sender and the gauge. This assumes the gauge is not damaged. They usually aren't.

Lookinto your sender. There's a ebay seller who sells the best senders for these Ttrucks under the name industrialstuffs.

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)