i guess it depends on what year/model audi you have. The 1280 is used mostly for B6/B7's who have a speed signal that is in the CANbus.
You should change your signature to include the year/model info for your Audi...and the RNS-E "stuff" that is installed. This will make it easier for us to answer your question.
You should change your signature to include the year/model info for your Audi...and the RNS-E "stuff" that is installed. This will make it easier for us to answer your question.