RS4 Start Button install into 8P A3
You will need to order the following parts to complete the installation
8E0 863 284 E 5PR - compartment for centre console with cigarette lighter and switch mounting (soul black) - £45.83 \ €83
8E0 905 217 - pushbutton for start system - £54.99 \ €110
8L0 971 883 - flat contact housing for push button starter system - €5.98
000 979 009 - repair wire x 2
The video below shows the system in operation. Note that pressing the button or turning the key while the engine is running has no effect.