I don't know so much about auomatics. I think I only raided in 2 or 3 automobiles that hat automatic gearboxes (I rode automatic gearbox buses too, but they are different).
I wonder how did this taximeters worked (early on when I took another look on the site I've noticed they also had the picture of one used in Romania):
http://www.fama.hu/index.php?mn=28&o...US-tegtlgsLBFo
The had a magentic stuff mounted on the axle like at the speedometer and then an electric cable camed or it was a far more complicated sytem.
What a mecahnical wonder inside:
https://www.youtube.com/watch?v=UkahxS2HoZo