Gas gauges on A-bodies

On a 67-69 A body rally dash (Barracuda) the fuel gauge includes the instrument voltage regulator. If this fails, it quickly burns out the fuel gauge and possibly the oil pressure gauge. Other A-bodies have a separate instrument voltage regulator, and since they usually have a idiot light for oil pressure, it is only the fuel gauge that is affected. This is probably more common than a sender failure.

The other common failure mode is the loss of the ground strap from the the sender unit to the hard fuel line. This is a sheet metal clip and it can rust or break from fatigue.