1968 Barracuda gauge issues

1968 Barracuda cluster issues
Hello everybody. I have an issue with my Temp and Fuel and I think my Gas gauge. No matter what I do when I turn the key to the run position the needles will slowly peg. I have four different Fuel gauges and when I test them they all do the same thing. I believe the Internal Voltage Regular in the Fuel gauge is not knocking down the voltage to 5 volts that goes to the other gauges. Anybody ever have the same issue?
Thanks in advance. Troy