Take a close up picture of it and the colored rings will allow us to tell tell you the value. As far as that goes, print out the pictured, and you can find a comparable value resister at Radio Shack with the clerk's help.

Big Dave

 

The value of the resistor will also be on the wiring diagram in the factory service manual.

 

The resistor is not typical. It is flat with a hole at either end, designed to go across the fuel meter terminals on the back. So it doesn't have the colored rings on it that denote value. Don't have a factory service manual for the car. If anyone has one, your help would be appreciated.

 

Typically it is a specialized ceramic resistor with the center colored "orange", "green" etc... Orange which indicates 85-86 ohms. The different solid colors indicated the different values used to calibrate the gauge for accuracy. It is used as a voltage divider.

Never done biz with these guys, but they do carry some? One?

http://www.rickscamaros.com/camaro-console-fuel-level-gauge-shunt-resistor-1967-1969.html

 

Thank you for the information. I have forwarded it to my friend. At Eckler's site there is some information that seems to say Chevy used the same gauges on all their cars after 1965 through the 90s and implies that the same external resistor was used for all.

 

Prior to 1965 GM used a 30 OHM circuit; after 1964 they used a 90 Ohm circuit; but I thought that resistance value was in the rheostat; not on the back of the gauge. I assumed that was placed there to dampen the oscillations sent from gas sloshing in the tank as you accelerated or braked or turned a corner.

Big Dave

 

Dave, what you say coincides with the article at the below link at Eckler's.

http://www.chevyclassicsclub.com/the-gm-fuel-gauge-mystery-1965-newer/

The article implies that the resistor would be the same for all GM gauges from 1965 through sometime in the 1990s. Very interesting.