Looks like a good choice on the 3x. My engine wiring harness has been hacked up pretty good and it still provides a clean signal to the pcm somehow. Looking back on it, i wished I would have went with the 3 or pro and wired it in myself. If you run into any roadblocks, be sure to post them up in the MS section on the corral or
http://www.msextra.com/forums/index.php. Matt Cramer from DIYAutotune will usually chime in to help you out, along with the devs of tunerstudio. The MsPnP doesnt come with any spare inputs, and I wanted to be able to log fuel pressure, so Matt posted up how to reconfigure it on inputs that I wasnt using. Next issue will setting up a guage for it using that input in tunerstudio with the ini file, but the devs are really helpfull so im not worried about that when the time comes. My car has 5 extra gauges in it right now.The plan someday is to remove all of them and install a tablet in the radio area, running MSdash with bluetooth.