I recently have started the adventure of installing a b7 RNS-E in my 99 a4. Alot of the info on RNS-E swaps pertains to cars post 2000. I don't know if that makes too much of difference but I figured I would check. So far I have a GPS Antenna and Various Trim pieces to make things look nice with some modification. I have read that I would need a can bus adapter in order for the RNS-E to sync with the analog clock is that the only function that the can bus serves? I currently have an aftermarket pioneer radio installed so my original factory harness plug is no longer there so one of the plug and play type adapters wouldn't work in my case. I'm guessing I can just look up both wiring diagrams and put the proper things together?