headlight switch
Just for reference, I just replaced my headlight switch, it was fun, NOT!
To get to the switch you'll need to remove the lower heat/AC duct going to the drivers side dash vent, then drop the steering column a little so you can get the speedo and tach cluster out, when this is done access to the headlight is very easy right through the speedo/tach hole. Make sure the neg battery cable is disconnected because the my new switch was in the on position, (when you remove the knob and rod it leaves the switch in the on position) and that switch will get hot quick (ceramic heat sink behind the dash brightness pot).
I would suggest while the speedo / tach cluster is out you replace all the bulbs and clean / refurb all the sockets and while you're having so much fun with the dash you might as well do the gague cluster while you're at it. On the plus side, when you're done, the dash lights will be like brand new.