I'm not sure if this is already posted somewhere, but I just drew it up in paint, so I'm gonna post it.

When I was removing the dash bezel, I ended up breaking that plastic screw that holds that pull-out headlight switch in place. Instead of ordering a new one (I hated the pull out switch anyway), I made up my own new switch thing. Two LED switches from Kragen, a rheostat (Catalog # 271-265) and a knurled **** (Catalog #: 274-424). Here's the wiring diagram:

 

Halfway installed:

 

Kind of curious here but where is the wire that would operate your instrument lights?

 

The instrument lights come on with the parking lights, so there's no extra wire. That's why the dimmer is wired after the parking lights, because it's not necessary otherwise.