Re: 78 fuel guage stopped working!
Welcome, Gareth. In the body harness from the gauge, measure with an ohmmeter from ground to the tan wire - goes to the fuel sending unit in the tank - and you should read some resistance between 90 ohms (full) and zero (empty).
Not reading any resistance would mean an open circuit from the wire end to the black wire connecting to body ground by the tank. Sometimes a wire brush is needed to clean the wire lead and body for a good connection.
If you have resistance, then you need power from the battery/ ignition circuit to the other terminal on the gauge. Could be a blown fuse or a corroded fuse socket.
The above is for a GM product. If Chrysler, aka Barracuda, I don't know the wire color, but 90 ohms is empty and 240 ohms is full.
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