Gauges in-
I can only assume that the lights in the gauges are white as I have not connected them yet. Quite a few wires back there. I also made a little mount for the tablet and I have a speaker (Bluetooth JBL) that I plan on hanging from the dash once I make a bracket. The color match is actually better than the flash shows and it fits in there pretty neatly. One day when I get other stuff finished I'll put a new dash and wood in there and clean things up a little more.
Regarding color of lights, I had a 320i in '77 (actually mums car) but I remember reading the manual and it said the lights were "red" because their studies indicated that that was the easiest in the eyes at night, meaning that the pupils did not dilate (as much) when looking at red so when you glanced back to the road you were still focused. If only they put that much thought into a few other things