73 Dodge Dart Sport Fuel Gauge Wiring

I'm starting to understand. So since all the wires connect up at the main panel wiring. I would like to test the wire from the sending unit all the way to the main panel connector for resistance. Which setting should be on the voltmeter? I can follow the wire to the 8 pin connector near the fuse box, then I lose it. My manual shows it as being Dark Blue all the way home. This would help me know if the gauge or the wiring is bad. Sending unit is new.
Thanks!