Out of curiosity I went to the local 5 star chrysler dealer today and asked the parts manager how much an otis or evic would cost. He said, huh? I said anOtis or Evic very slow. I got a blank stare. Then I said a trip computer. The Manager says OHHHHHH, you mean one of those. lol. To his credit he knew how much they cost without looking it up. Upwards of $400. Ouch.
There is a real nice write w/ photos up in the "How To" area of the site on installing an OTIS or EVIC, if you need. You might get lucky and have wiring for a auto dim mirror in place already too. I did in on car, didn't in the other. In the BST threads there are people who can supply you with either device , but the EVIC is soooo much nicer, and I recommend getting that from Treppenwolf (no offense to other sellers).