1966 chevy c-10

[walkman]

NEED SOME HELP- have a 66 c-10 project fuel gauge was not working bought a new sending unit and float ,when wireing is not connected the gauge stays on full, when wireing is connected it stays on empty. Someone told me it needs a compasitor but don't know where it would be any help would be deeply appreciated

[TJ's Chevy]

Sound like a bad gauge. Is your tank full? Make sure there is a good ground for the ground wire(on the sending unit). And make sure your bots are snug, but not to much cause you could snap the inner wire that goes to the unit. Hope this helps. T.J.

[1963c-10]

There is a 0-30ohm resistor on the back of the fuel gauge.

[luvbowties]

Did you buy a 0-30ohm sender(correct)?...or a 0-60ohm sender(wrong)? If you got correct sender, pull up wire from sender going to gauge--lotsa times it is shorted to floor (as it runs below the sill mldgs. and under the floormat). To do a quick-check for this short, cut-and-replace that wire at end where it leaves tank AND at end where it enters gauge--all with one consecutive piece of new wire, leaving original wire 'loose at both ends'. If it works right, just "bury" this new wire. Gauge of 16 would be great!
Sam