http://www.trdparts4u.com/Scripts/prodView.asp?idproduct=-7313
It's just the switch. Apparently the wiring harness is standard on all FJ's so the plug for the switch is right behind the panel. Those of us who have locking diffs and no A-trac can just add A-trac by adding the switch since the capability is already there.
Here's the "How-to": http://www.georgiafjcruiser.com/fj_cruiser_a-trac_switch_install.asp
Thanks for the phone number Sanderhawk, I'll try to give him a call later today.
~AP