You willl have to get the ATC harness and either splice in wires or replace the entire dash harness. Either way you will have to take out all or most of the dash, replace the blower power module, and add a sunsensor if you don't already have one in addition to putting in the automatic head. It is not as simple as just swapping out the controls. There are alot of threads on the subject and you can find them by doing some searches on ATC. Here is one that I made with some tips & instructions on how to remove the dash.