My car with DRL (if I understand this correctly) still has a headlight switch with settings of "off", "parking", and "on". Both "off" and "on" illuminate the headlights, but only "on" lights the dashboard. ("Parking" lights the dash, cuts the headlights, and turns on some orange lights around the car.)

With my trusty headlight sense wire, "on" also engages the dimmer for my empeg. Just as expected.