Head Light Sensor

Is there a way to change the setting on the headlight sensor so that it will turn the headlights on sooner? It has to get pretty dark before they come on currently. I was thinking about taking a sharpie and shading part of the sensor cover to see if that would do it, but wasn't sure that is the best way to make the change???

I am not a tech but I would guess you don't want to color anything with a sharpie.

hmm mine come on at about the right time.

but yeah sharpy not a good idea

I need someone who knows anything about the GXPs. I ahve an 05' There is an intake for the 06'. They claim it won't work with my car, yet the dealer says that the part numbers and setup are exactly the same from 05-07. Any ideas, Grand Prix family or who might know?