Fuel gauge and sender questions.......

[daveintexas]

I installed a new fuel tank and sender in my 74 vette. The questions I have pertain to the hookup on both the tank sending unit, and on the guage. The spade terminal on the sending unit is for the positive wire? There is a red wire on the car that is for a spade terminal, and it has 12 volts. I don't have a ground wire, and the sending unit has a node that looks like possibly a ground terminal?? Am I right in thinking this? The other question is on the wiring on the guage. The gauge is an Autometer, and not factory. It has 3 spade terminals It has an I, and S, and a GRD. I have 2 wires in the dash for the fuel gauge. A red one that is 12 volts, and a pink wire that has no voltage, and there is no ground wire. Any idea what goes where on the guage?? Thanks to anybody who can help me with this!!

 

[LLC5]

I installed a new fuel tank and sender in my 74 vette. The questions I have pertain to the hookup on both the tank sending unit, and on the guage. The spade terminal on the sending unit is for the positive wire? There is a red wire on the car that is for a spade terminal, and it has 12 volts. I don't have a ground wire, and the sending unit has a node that looks like possibly a ground terminal?? Am I right in thinking this? The other question is on the wiring on the guage. The gauge is an Autometer, and not factory. It has 3 spade terminals It has an I, and S, and a GRD. I have 2 wires in the dash for the fuel gauge. A red one that is 12 volts, and a pink wire that has no voltage, and there is no ground wire. Any idea what goes where on the guage?? Thanks to anybody who can help me with this!!

Without seeing it and testing wires I would assume that "I" is an ignition source into the gauge, "S" is to the fuel sending unit, "GRD" is for a ground source to the gauge and should be installed if the factory harness does not provide one. The spade terminal on the sending unit should be installed to the "S" terminal of the gauge. The sending unit itself should have a seperate ground wire run to it if one is not already there. Hope this helps.

 

[JohnZ]

I installed a new fuel tank and sender in my 74 vette. The questions I have pertain to the hookup on both the tank sending unit, and on the guage. The spade terminal on the sending unit is for the positive wire? There is a red wire on the car that is for a spade terminal, and it has 12 volts. I don't have a ground wire, and the sending unit has a node that looks like possibly a ground terminal?? Am I right in thinking this? The other question is on the wiring on the guage. The gauge is an Autometer, and not factory. It has 3 spade terminals It has an I, and S, and a GRD. I have 2 wires in the dash for the fuel gauge. A red one that is 12 volts, and a pink wire that has no voltage, and there is no ground wire. Any idea what goes where on the guage?? Thanks to anybody who can help me with this!!

The original gauge wiring had two wires - a pink wire that supplied 12 volts to the gauge, and a tan wire that ran from the gauge to the sending unit.

At the sending unit, there was a connection for the tan wire, and another for a black ground wire. There was no 12-volt power at the sending unit; the tan wire circuit from the gauge went through the variable resistor on the sending unit to ground.