Looking from the rear of the Gauge Cluster, the left terminal goes to the fuel tank sender and the right one ties into the ignition hot line (same lead as on the right hand terminals on the Temp gauge & Oil Pressure Light). Don't forget to properly ground the fuel tank sender body to the chassis. See link for additional info on restoration wiring kit from AAW - it should help.

http://www.americanautowire.com/PDFLink/92965069 500425 IN 5.0.pdf

 

Reference drawing in Assembly manual. .... http://www.trifive.com/garage/55%20Chevy%20Assembly%20Manual/12-4.gif

 

Finished wiring up and I also replaced the headlight/lighting switch as the gauge cluster lighting didn't work. The rheostat to the old switch was crusty with green corrosion. Once finished, the cluster back lighting still does not work. No power from the terminal on the new switch. All fuses are good. Got the switch from Danchuk. Everything else works. Help Again and Thanks!!

 

ZZ, just guessing here, but do you have the cluster out of the dash? If so, it's not grounded. Must be in dash ( or temporarily ) grounded for dash lights to work.

 

I thought the 3 amp fuse was good but once I removed the switch, I found that the fuse had blown. Guess I'll check each backlight circuit (gray wires) to ground and determine the culprit. Thanks everyone!