On the older stuff, it is basically a couple of wires a sending unit (variable resistor) and gauge (ohmmeter). Give us some more information. I looked in your profile and it says 79 Power Wagon with Auto Meter Gauges. Some companies require their own sending unit. Auto Meters website should have instructions. If its stock let us know someone probably has the shop manual (a recommended purchase) and tell you what you need.
Could be bad connection at the firewall under the hood or a bad sender in the fuel tank. You can pull the wire connection off the sender at the tank and with the key on momentatily ground it and the gauge should go up to full..if if doesnt than you have a wiring or gauge problem...if it does go up then you sending unit or ground at the tank is bad.
take your plasma shrinker ray gun and midgitize a buddy and a boat. drop them in the tank with a walky walky or a cb. then they tell you when you are starting to get low. then ya fill up. just dont drown the suckers or they could get stuck in the fuel lines.
The wires are connected to the sender in the fuel tank..its on top the tank where you'll find the connections...then the wires run along the frame to the firewall connector and then the dash harness wires attach to the firewall and run up to the instrument cluster and fuel gauge.
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