Hi, I have a 2003 A4 Avant B6 Q Sport and I would like to install auto lights/wipers. I have read a number of threads on the subject but they all appear to be for the A3. I have the Auto dimming mirror, new windscreen, light switch and kufatec wiring harness for the auto dimming mirror. Can it be done? if so what else do I need and how do I do it???? Thanks in advance.