I saw I had some views, but no replies, but I wanted to give everyone that viewed a quick update on the 08 model.

I was able to contact Supra directly, and on the 2008 the analog and PP systems are tied together mechanically. So, to calibrate the speed, you hold the ENTER button for 3 seconds, which then brings up the speed calibration setting, and you want to do this with the PP in the OFF position. Then using some form of GPS, cell phone for instance, calibrate up or down.

We are now within about .2 tenths of a MPH on calibration.