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I would suggest at the headlight switch. The wire to the dimmer wheel. Probe it and work the wheel the probe light will dim with it. I don't remeber the color.
In the fuse panel, theres a 10 amp fuse marked illum. Just get a mini fuse tap and hook your gauge light to it. Its the fuse for the dash light, so it will dime your new gages with the dash lights.