I think the tuner is a little box type thing that connects to the antenna cables and also to the white clip hanging off the back of the car dock. From my experience installing my riocar, I noticed that there isn't much (if any) room for a box type thing behind the head unit. I had to carefully fit the wires into the little nooks and crannies that were available just to fit them behind the car dock. I think this is related to the heater controls thread, as the 95 controls/vent system seem to take up quite a bit of space behind the dash.