Curious about how some of the electronics/lighting works in the Holden version (so presumably the G8):

1. One of the pictures has the screen "background" color as black. This is a good thing: the Cadillac STS is green or blue or brown, very distracting. But: can the colors be changed? What can be customized or not customized on the screen?

2. Can the screen be turned off completely? If it's off, does the oil pressure display change to show a clock or station or something?

3. In cars where the gauges light up red, does the entire gauge/button lighting also glow red? (That would be good. I like red. :)) Or is everything else white?

4. Stereo: can the midrange be controlled (like in most other GM radios), or is it bass/treble only?

Thanks for any info! Nothing urgent, just idle curiosity.