As for backgrounds i can change them using my old copy of the 2006 discs. The 2007 nav disc's have bad data to error a burner so i can't mess with them yet. Im working on it as i hate the standard backgrounds. Acceleration and direction will all work once the unit starts to calibrate its self. The vehicle speed sense wire helps with accurancy but i have been fine without it. We can work out something on the discs. Let me know what ya wanna do. The gauges can be changed from the standard on the disc, i think there are like 6 options.