In order to get the factory AUX then you'll need a 2003 or newer radio module.
There are some aftermarket AUX kits from companies such as Blitzsafe and Soundgate.
You may also want to check with Tom G. to see how close Dension is to having this capability ready to go. It's there in firmware (it shows up on my nav screen as an additional source), but I'm not sure how to actually connect something up.
