There are 2 ways of doing it, first is the cheepest.
1. Go to radio shack and get a 3Amp switch for it and you have to cut some of the plastic away to make it fit right - this is how it is setup right now in my car
2. Buy another Assy. for that and take out on of the switches from the new on and add it to the old, and finding the 2 wires that you need for power and ground - this is what I am going to do