The installation kit is complete and easy to install, as long as the vehicle is equipped with an ACC function, or the radio can be incorporated completely off. I have the original 2 DIN radio RCD 310 exchanged in my Caddy against a DIN 1 Pioneer DEH X8600 BT because it just has more features than the original. If a layman also been a problem for me when the Pionner turn off completely could, or the Caddy would have an ACC function on the steering wheel, both of which is not the case. It therefore had a continuous positive übern mounted toggle switch on the ignition plus the radio will have switched to the radio without the ignition being able to operate and also just off completely. Otherwise the car battery would be when the vehicle is for a few days, by the standby radio this pretty "chipped". This installation method, I must confess, beyond my expertise on this matter. I can therefore do it in a workshop. But as already mentioned, the installation kit is highly recommended and the price absolutely, if just agree all conditions. For users with more knowledge as I do, this set is great, as it is fit for the VW connections (as stated in the article description).