Did you not get my PM? I sent you a link to the installation guide!

You have to buy an independent relay from any car audio shop or automotive parts shop. Just ask them for a simple 4 pin relay...they should know.

Locate the video module (under the spare tire,) the positive and negative wires going to the reverse light bulb, and connect the wires to the relay as per the link I sent you. You can hide the relay anywhere once it is connected.

The relay completes the ground connection to the video module when the reverse light bulb goes (when the car is put into reverse gear) and over-rides the navigation screen with the reverse camera image.

I will see if I can take some pics to help you out...