Fuel gauge wiring

[bnoon]

All I can find in searches is "check your grounds" or how to power aftermarket fuel gauges... I need to know where the feed line to the fuel sender is supposed to end up under the dash in my '74. The needle is pegged all the time, but I know it's not the ground because I've had the tank out, swapped with one from my known good parted out Julius truck... and rebuilt the ground strap/wire. I later found out the feed wire to the sending unit was cut/burned at some point by the previous owner and I can't seem to find the other end anywhere. Seems to be white coming from the tank, but could be a faded other color, I just can't quite tell. If someone knows the pin number and/or wire color off of the back of the cluster I can trace it from that direction. Thanks!