How do you install a new radio on a 1993 jaguar xj6?

The question does not give enough information. If you want to install an aftermarket radio then I suggest you take it to a store who sells and installs aftermarket radiOS. The reason being the plug that Jaguar uses and that is pluged into the OEM radio has roughly 14 pins in it and a installer probibly has a connector which you will need to connect the cable to the aftermarket radio. On the other hand if you are installing a OEM Jaguar replacement, which would be my choice (Keep Jaguar, Jaguar) the removel and install of the OEM radio is easy. 1. Apply the emergency brake and place the shift lever in reverse (engine off) then go to #2 2. Disconnect the battery before you do make sure you have the radio code if your radio has one. 3. Open the center counsol and remove the two screws that hold in the ashtray in then close the ashtray lid you need to in order to remove lift the ash tray out and disconnect the connectors to the cigarette lighter. 4.Next you need to remove the trim on the gearshift With a thin and I mean thin screw driver gently pry between the shifter and trim ring at the 10 oclock 2 oclock and 6 oclock positions to release the trim ring remove the trim ring and unscrew the shifter knob and remove. 5. where the ashtray was attached to to the center counsol (the ski slope) reach udeneith and find two large plastic wing nuts remove them. Now the center piece can be removed. 6. The climate control, clock and radio are held in by a plastic frame held to the counsol by six screws remove them and gently remove the frame. I said gently because you dont want to break the frame. Its almost impossible o find a replacement for it. 7. Disconnect the connecting cables and remove the radio from the frame 8. Installation is just the reverse of the removel. Hope this helps Mike