remember it is illegal and dangerous to drive with video on in front seat.
Not sure what model, but most likely this will work.
Radio Shack will have parts.
If its for an Alpine there are 2 switches needed.
1. A toggle to simulate e brake
2. A momentary (push button-PB)simulate the regular brake.
Both switches should go to ground, if I recall. If not put 12 volts on PB switch.
Procedure is as follow press regular brake(PB) and hold. Turn toggle on off and on again, release PB
Let me know if you have more questions.