88-91 fuel gauge vs 92-95


does anyone know if the fuel gauges from the 88-91's aoperate at a diffrent ohm level than the 92-95 fuel gauges?

i have a 91 hatch, complete wire harness conversion to 92-95, with a z6 motor swapped in...
gauge cluster was hacked/cut and reassembled to fit and look like stock, just with the newer gauge cluster, but the fuel gauge either reads completely empty, or completely full depending on which way the wires are hooked up, but it never reads in the middle, where it should...