Garmin Zumo 660 - Cable?

[Rbharrison]

I have a 2011 Vaquero and want to mount my Garmin Zumo 660 GPS to it.

• What cable do I need to interface the Zumo 660 into the audio system of the bike?
• Can I be listening to my radio and have the GPS kick in over the radio to say it's bit and then return to the radio?