My 71 gas gauge always reads above the full mark like its calibrated high, (standard idiot light panel).
I changed it out with another from a junker that I use for parts it did the
same. I was told it was a resistor? could it be the sending unit or bad ground? I checked them all. Any input would be helpful

thanks,Mark

"Always" as in even when the tank is empty?

Go here for info:
http://www.chevelles.com/techref/ftecref18.html