I recently did a complete rewire of my 82 Sierra k10 and have all functioning gauges with the exception of the gas gauge. I had to get a new cluster and used one out of an 86 model truck. I used a painless harness and since the harness is for years 73-87 I wired the gauge plug for an 86 model according to their instructions. Everything is working except the gas gauge but when I turn on the headlights and hit the dimmer switch to high beams the gas gauge will go up to full. Turn it off and it will slowly back down. I'm assuming its a ground problem but not sure where to start. I replaced the sending unit and pretty sure I have it grounded good to the frame. Could it possibly a ground loose or disconnected at the cluster itself? I have all but maybe two or three of the cluster bulbs that need to be replaced and am wondering if that may be the problem? Kinda like when your turn signal bulb burns out how the blinker will either flash quickly or not at all. Anyone have any ideas?
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