Noob question; Installing intellitronix digital gauge, (tw: LOTS OF DUMB QUESTIONS)

Neither of that should affect headlights

Headlights path:

Power to the headlight switch comes DIRECT off the ammeter "welded splice" in the big black ammeter wire behind the cluster. That goes direct to the HL switch and powers ONLY the headlights, nothing else. There is a breaker in/ on the light switch. With the HL switch on, the HL power goes down to the floor dimmer switch, where it comes out either for high or low beams, and then runs out through the firewall connector to the lamps

CHECK THE GROUNDING on the front lamps. Some years, all the wires hook to one grounding lug up near/ on the radiator support