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Rich E, You might already know all this info but...here it is just in case....
As far as install goes with your 8120, You will need some other pieces to make this work. For the ipod ( you will need the Ipod-kenwood adapter), might be able to keep current sirius ant..but you will need SiriusConnect Universal Vehicle Tuner and cable, and need to transfer your service to new tuner, as for the steering wheel controls ( u need the correct Pac-module (or other manufacturer) for your GM vehicle...do you have Bose speakers, if so, are you keeping Bose or putting in different speakers and amps? depending on your choices, requires a different pac-module ), this Pac-module will also give you GM connectors so your not having to splice power,trigger,ground, and speaker wires etc...) as far as camera, there is another part(for auto reverse gear picture, but I think it comes with kenwood camera but not sure... hope this helps.....
Sinjin....sorry, just seen you already got all this 8120 info covered in previous replys...sorry guys...Happy new year everyone