when you say a fuel gauge IC what are you refering to?
in automotive (my feild) you have a 2 cross coil movement, (sin cos) and 2 op amps biasing both coils based on the voltage drop from the sender,
the sender will be a potentiometer say 10-180 ohm, and you will have a resistor fed off positive to make it into a voltage divider,
really some more info would help :?