Assuming it is the same as my '93, i used Allen wrenches to release the little clips that hold the factory unit in. There is a special tool, but I managed to get the clips undone fairly easily. You could also go by a car audio place with the car and they would likely have the tool and help you out. I went to a car audio shop and bought the correct wire harness kit to plug the aftermarket unit in. It's best to kind of have someone around who knows what they are doing, or just have it professionally installed. Sometimes trying to save $50 can cost you more in the long run!