mobile video in semi with air brakes

sorry to be so negative but the semi trucks tha have air brakes have two kinds of air aplications service brake that engages when you press on the brake pedal and you get your brake lights and theres the emergency or prking brake that when engaged you get no lights at all not even on the dash what you can do if you wana do this is put a brake pedal switch wich you can get at any truck parts store and put it to the emergency (parking) brake air line you would have to play around with it for a while but you can get it to work all the switch does is it works with air pressure so you can just tap into one of those air lines.

let me know if you do this and what truck your using it on

also i just thought ill let you hnow in slot of the big rigs you have to find wire by wire (+12, ground, speakers) because all the wires in the whole truck are the same color.