remote start on 2002 mustang v6

I've never installed one of those. Looks unnecessarily complicated, compared to some of the other modules out there, but it should work. To access those immobilizer wires, probably the easist way will be to get them right at the car's immobilizer module itself, behind the ignition keyhole. Look under the steering column shroud, and you'll see a few large holes there with screws inside, as well as one smaller hole. Turn ignition to Run, insert thin tool into that narrow hole, push.....and then you can pull the entire ignition switch straight out of its hole. Then, undo the screws, take the black plastic cover off the steering column, and you can see everything. P.S. You did already get a second key made for your car, correct?