If your wanting to keep your factory head unit in your VT – VZ there’s a good option done by a guy called Greg at ASR Audio. He can add RCA out and Aux in to your factory headunit. Very good work. Drop him an email at phreddy.asr@gmail.com. Was only $275 not including post. Much easier then replacing the headunit then having to fork out more money for steering wheel controls and lose the cluster integration. As you can see everything is well labelled. 2nd picture is where I put the aux in but you can put it where ever you want. Automatically detects aux input, mutes the radio and puts the antenna down.