Fuel gauge trouble

[jrm1486]

Can anyone explain the resistor on the back side of the fuel gauge?.
My fuel gauge was relaaced along with the sending unit in the tank. Since that
time the gauge
reads backwards and very inaccurate. I have triple checked the wires, ground,
ignition,and
sending unit, checked the ignition for power it was ok, the ground was good. I
even ran an
external wire to the tank with the sending unit pulled out and operated outside
of the tank
the guage shows full when float is full down. When lifted it goes to empty, I
noticed there was
continunity amongst all of the connectors, I removed the resistor and for some
reason the
guage now reads 1/2 which is close as measured off of a yard stick.
Any of your vast knowledge would be appreciated to help me fix this Pain,
Thanks

John

1984 RB 35'