Originally Posted by cliffyk

Do you know how it works?

Since the vehicle has no gear position sensor I envision some sort of mercury switch or other position (relative to level) sensing device as used in the various electronic "levels" that are out there.

If so then the response would have to be significantly dampened to allow for normal pitch, roll, and yaw in the vehicle's motion.

I've had one of these for a couple+ years and use it all the time for camber and caster alignment...