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It may be the sending unit in the tank that needs replacing. Here's how you can check: Turn the key on and disconnect the sender unit at the gas tank. Ground the sender unit's wire with a jumper wire from the truck's harness to ground. Watch the gauge. If the gauge on the dash is good, grounding the sender wire will cause the gauge needle to react and should move to full. This would indicate a new sending unit is required. If the gauge doesn't move when the sender unit is grounded, the gauge is bad and needs replacing. Pull the instrument cluster out to replace the gas gauge. Likely any old ford gas gauge might work-back then, there were not so many production changes.
if you have auto daytime lights and they don't work then your radio will not work either. trust me on that. you have one lead to 12v source and acc lead that is wired to auto daytime lights which when you open your door radio shuts off.
Check fuses for instrument panel. May have to disassemble the gauge instrument cluster and check the connections to it in the back. Otherwise, the sending unit in the gas tank may be bad, or wiring to it.
A poor electrical connection in the circuit to the A/C pump. A lot of times it is a simple splice needed near the pump. As the lines on gas (freon or any other) when compressed, get hot. It's easy to accidentally let one of those wires hit a "hot" spot during other activity, under the hood. CHeck that the connection on the compressor (or if 2 connections) are clean, & secured.
check the connection for the fuel pump at the right rear wheel just above the control arm. the connection gets corroded and causes the fuel pump and gauge not to work. if the plug looks good then most likely the fuel fump assembly is bad.