I have my XM SkyFi2 hardwired except for the antenna. I drilled a hole in the little storage compartment and ran cables through there. I used a PanaVise mount since the ProFit didn't fit too well. For power, I just tapped into the extra +12v line running to the radio.
If you want the Skyfi to come on and go off automatically....what you will need to do is tap the power wire from your XM into your 12v Acc. wire at your radio instead of your 12v constant. the 12v Acc wire only has power when the radio is on, therefore your SkyFi will only power up when your radio is turned off
I wired it to the pink and yellow wire on the head unit. The XM will now come on when the key is on, it does not come on with the radio. This seems ok since now when I turn the igniton off the XM will go off as well
Thanks for the help!!!!