In factory configuration A/C lights on own circuit, keyed to ignition, not headlight switch. Illuminated whenever car is energized. Faux pas IMHO. Don't know how many amps the bulbs draw, so you might want to measure before attaching to rheostat. Remember: red/orange line into rheostat only 16 gauge. I've rewired my entire headlight circuit, including keying A/C lights to dash switch. Schematic in #5939's photo album (still current except 1A fuse AFTER dash switch has been removed -- getting crowded under shift boot). Note: other than red/brown line moved from A/C panel relay, circuit is now 14 gauge until it gets back to fuse block. Re: clock -- mine's always/only been 12 hour so I can't help you there (is it OEM?). Was annoyed by dimming with headlights, so I cut that line when rewiring circuit. Display is hard enough to see as it is (bad angle). Bill Robertson #5939