Just purchased this!
I just purchased this mirror from Atascadero Ford Outlet (800) 549-2005, ask for Gary Starr and tell him Trevor sent you ... Cost was $225 + $10 S&H. I have yet to install the mirror, but the install instructions are very detailed and look quite easy. The mirror comes with a wiring harness that plugs into the back of the mirror, a temp probe with wiring to plug into the back of the above mentioned harness, straps, and misc. hardware (fuse adapter, elec spades, etc.).
Install looks pretty straight forward: mount temp sensor to radiator mounting bracket, run senor wire through firewall into cabin, run sensor wire up A-Pillar and plug into rear view mirror wiring harness. Then, run the wiring harness accross the headliner, down the A-Pillar and to the fuse box. Ground one wire (wire type coded, one copper color, one silver), and tap the electral system via fuse adapter and fit the other wire with the proper spade and plug in.
You will need some tools for the job like a circuit tester to see what fuses are hot in the 'On' and 'Acc' settings, and you will need some Blue RTV to seal you hole in the firewall/brake boot. Trust me, this is my recollection from reading the install instructions ... VERY DETAILED STEP-BY-STEP. I can not comment on anything until I have the unit installed, which I will be doing next weekend.