I got mine from an '00 Explorer. The auto-dimming feature simply requires a power and ground. I used the ones that were already there for my OHC. I also ran the wires for the auto-lamp function (that automaticly turns on and off the exterior lights depending upon darkness outside and will keep them on for awhile after you take the key out and exit the vehicle) This is the tricky part and there is a writeup on someones cardomain site about how to do it but I can't remember where it was now.
there should be a write up on john griggs's cardomain on how to tie it in with the OHC from the explorer... i have had mine sitting in a bod in my garage for 2 years now since i installed my ohc... i really need to get all these mods i have done
If you can post a pic of your mirror then we can tell if my write up will work for it. If it wont, there are a few on here who have the electrical diagrams and they should be able to help find out the proper wires for the mirror you have.