Volkswagen Amarok

The Volkswagen Amarok is a mid-size pickup truck built by Volkswagen Commercial Vehicles (VWCV). The Amarok range consists of single cab and double cab, combined with either rear-wheel drive or 4motion four-wheel drive, and is powered by turbocharged gasoline or Turbocharged Direct Injection (TDI) diesel engines.

Information provided by: http://en.wikipedia.org/wiki/Volkswagen_Amarok

Wiring Information
some early models had no Steering wheel control buttons and no accessories

For late models with a screen, the factory camera can be retained when installing an aftermarket head unit using a APVEU11.
This is usually used for adding a camera to a factory system but the APVEU11 can connect to the camera at the back of the tailgate .
Extend with an RCA cable to the aftermarket head unit.
The factory camera is already powered by the vehicle and not the factory head unit so there is no need to run a power cable.