How does the HU know how fast the car is going? I'm still trying (after 9 months) to override the 5 mph video barrier. IMIV's VWIM won't load using my nano, classic, or touch**. Is there a cable in the Melbus or elsewhere that I can feed a constant voltage to to trick the system out? A sensor I can remove? Anything? I'm about to drive from FL to WA and could really use video.<p>Thanks.<p>**Yes, I know how to load firmware. I've done it successfully several times. VWIM is the only program that won't work.