I put a 66 guage cluster in my 65. I have a 3 guage pac(oil pressure,volts,temp)under the dash which is ok. All I care about is getting the fuel guage working. Of course the 140 speedo works. I had the fuel guage working when I first hooked it up, but a few days later is stopped working. Help
Try what Isky recommends. If your gauge doesn't deflect, I would suspect the VR on the back of the gauge panel (especially since the gauge worked for a few days.)