[jwakil]

Originally Posted by ewave

The reason you are only getting four pulses with one rotation of the wheel is because of the differential unit!

With one wheel stationary, you have to rotate the other wheel two full rotations for the equivalent of both wheels rotating one complete revolution.

Here are three links to ponder...

http://forums.pelicanparts.com/porsche-911-technical-forum/372410-sewer-backs-up-speedo-smokes.html

http://forums.pelicanparts.com/porsche-911-technical-forum/247776-carrera-vdo-speedo-sucks.html

http://forums.pelicanparts.com/porsche-911-technical-forum/485078-vdo-really-really-really-sucks-930-turbo-speedometer.html

I thought about that at one point but disregarded it because none of the other postings I had read even mention that, so I thought no way!