The gauge works like an ohmmeter. When there is 30 ohms resistance on the sender it reads empty. When there is 0 ohms it reads full.

Last edited by cletis; 05/11/2010 2:13 AM. Reason: Whoops, I meant to say ohmmeter.
"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.