Do i need to use my original wiring for stuff like washers ,fan switch, wing side reapeaters,heated washer jets,fan cotroller etc ,how many parts to the mk4 loom are there as i have the main engine loom coilpacks etc,im waiting on another part which is the big ecu plug that does the lambda etc and has the coloured plugs orange blue white, does this part have them on or there another part that im missing,im not great with wiring at the best of times ,please shed some light on this guys