It's gotta be the headlight switch right?

Ironracer this old thread had me confused. You did say, right? That you DO have tail/ park/ side markers? If you do, and you do NOT have dash lamps, then the trouble is either IN THE SWITCH or IN THE inst fuse (the tan goes from the dash dimmer control TO the INST fuse, and then to dash lights

If you do not have it on the tan going into the fuse, then it is a bad dash dimmer control Try twisting the control vigorously from left to right a few times to "clean" the rheostat

You know the trick about pulling the switch? AKA the release button for the knob and shaft?