hook up the foot brake wire(yellow black stripe i believe) to the foot brake switch,then put a switch on the yellow blue stripe wire and ground it,,the unit has to see a combination of power and ground...12v(footbrake )on, ground on ,off, on...release foot brake....in other werds...after all is hooked up...put your foot on the brake..fllip toggle swith on ,off, on then release foot brake!...this will werk until you cut the car off..ass soon as the ignition is lost the combonation will have to be done again...although while driving if you flip the swith to turn the video mode off,then all you have to do is flip the switch again,to get the picture back!