The only electric gauges are the fuel gauge and the ammeter. I'd be surprised if you DO have a working fuel gauge. Usually the sender gives up the ghost in those old girls. To check it out pull the top dash panel back a bit to get access to the back of the fuel gauge. It's held on by those four 5/16" cap screws that might or might or might not twist off. Find the wire that comes off the top of the fuel tank to the fuel gauge and ground the terminal it hooks to with the switch turned on. Just bump the grounding wire to the terminal in case you're touching the hot one. You should NOT have sparks at all. If you are getting power to the gauge and the gauge itself works and you are touching the right terminal it should peg full. If there's no reaction, run a jumper wire from a hot source to the power side of the gauge and try it again. When you first touch the jumper wire to the gauge just bump it to the gauge to see what happens in case there's a short somewhere that makes smoke. You'll figure it out. It's pretty straight forward. If the sender is bad they are available now in the reproduction market but I'll be darned if I remember where. Someone else might chime in. I got a repro sender and refurbished gauge for my 630 and it works fine. Jim
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