I added the XM reciever/antenna to my Garmin. It Plugs into the AUX input like an MP3 player. I mounted my Garmin Zumo 550(with XM antenna) to the recessed area above the Tach on the dash of the streetglide via a diamond shaped "Ram mount" ball, a short arm and another ball mounted on the Zumo. The power cord is plumbed into the accessory switch plug which is actually under the seat. I also have another identical ram mount ball on the same area over the Speedo so I can run my MP3 player or other accessory. Ram Mount has some great solutions and a place called "cyclegadgets.com" has all kinds of neat gizmos and solutions.