1972 monte carlo base. I replaced my sending unit and sent the gauge out to be repaired. My gauge falls to a 6 0clock position when the switch is off to whichever side it is registering when turned off. The gauge reads only 3/4 tank when full and goes down past 9 0clock position when it is low. I have never run it out. I don't recall a resistor in mine that others mentioned in some posts at the back of the gauge. Does anyone have a suggestion and if it is a "resistor" issue does it have to be mounted to the gauge or can it be anywhere in the sending wire?