Dim lights in dash

Easiest is to spray "contact cleaner" on the reostat, which I think you can do without removing the headlight switch. That often fixes it. If you do remove the switch, a new one is ~$11. I put super-cheap from Hong Kong ebay LED's in the dash of my 65 Dart and they look great, with a modern bluish glow, similar to dgibby's. I recall that the dimmer works. My main motivation was they should last forever and less heat to degrade the plastic lenses.