I was reading the Pontiac Vibe owners manual and it seems the automatic light control works when the lights are in the off position, unless the parking brakes are up. Interesting. I’ll have to see how straightforward the retrofit is. Having to drill into my dash to wire and mount a light sensor has me a little skittish. If I’m pretty bad at leaving the lights off while driving, I’ll figure something out, but I don’t think my blindingly bright head unit will let me be bad.