Reply to "Fuel gauge reading full all the time"

In your two pics showing the light on, what switches do you have on? Ignition? Headlight? Both? Is it the bulb that is connected to the yellow wire that lights up?

With all of the wires disconnected from the gauge, turn on the ignition switch. Which wire(s) become hot? Should only be the red one.

Turn off the ignition switch and turn on the headlight switch to the first position. Now which wire(s) is (are) hot? If the yellow one is now hot, that is your gauge light and not the warning light. There should be two yellow wires going to this gauge. Yellow/black goes to the gauge light, and yellow goes to the fuel sender for the warning light.

It would appear that someone has done some rewiring, or at least replaced all but one (the white/black wire) of the connectors on the wires.

If the yellow wire in your pic is hot when the headlight switch is on, then that is your gauge light and it appears to be installed in the correct place on the gauge. If it is not hot with the headlight switch or the ignition switch, then this is for the warning light and it needs to be moved to the other, taller "tube", and the red wire (hot with ignition switch) needs to connect to the tab at the base of that taller "tube". The red wire also needs to be connected to the other instrument tab (it's the one sort of opposite the tab where the white/black wire attaches). It is the tab at the bottom of your last pic.

Check this out and get back to us.

John