Instrument cluster bench test in Electrical, Lighting & Electronics Posted May 17 Update to everyone who helped me on these pesky issues: After finding the way to test all of the instrument cluster lights, I was able to get all of the lights working - even the turn signals and bright lights indicator. The problem with them not working when I re-installed the cluster into the dash turned out to be the headlight switch. The gas gauge was another issue. I tried to find a remanufactured gauge, to no avail, so I ended up taking mine apart. I found that there's a very fine wire inside connecting the two terminal posts, and one of them was disconnected, probably when I was removing the nut/washers to replace the circuit board and CVR. I found a window defroster wire repair kit at my local auto parts store and it worked to re-attach the wire, then I added a drop of liquid electrical tape to make sure it didn't come loose again. The dash is back to functional again! Thanks again to everyone.