Usage:

To Disable the Modchip:
Option 1: Turn on the Xbox using the eject button
Option 2: Turn on the Xbox by quickly tapping the power button

To Enable the Modchip:
Turn on the Xbox by holding the power button down for 2 seconds.

Installation:

 
(Click to enlarge)

Note:For version 1.6 Xbox's please note the additional wires required