When I had my Alpine GPS installed in 17167 at a local circuit city, the guys realized in the middle of the installation that the D didn't have an electronic speed sensor. They told me they didn;t have the part at the time but if I brought the car back in a week, they would have it. They didn't charge me extra for a crazy alpine speed sensor that actually reads pulses from a spinning tire. (however, installation was about 120$ if I remember correctly) They mounted the device in the luggage compartment and used a large magnet to magnetize 1/2 of the right front tire. now the speed sensor sends a pulse any time it senses the right front tire make a rotation. The speed sensor appears to work remarkably well when I am planning routes with the GPS. I should note however, that there really doesn't seem to be a need to "magnetize" the tire as I have since changed tires and the speed sensor continues to pulse with each tire rotation. I have tried running the GPS without the sensor insalled and it is really crummy (you skip along the screen). Hope this helps Joe P. VIN 17167 6808 To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/