I have an electronic adjustable VDO speedometer and a VDO sender for
the beast, but I have no documentation.  VDO part 437-151 for the
speedometer.  This speedo reads signals from the sender, and you you
can set it to read mph or kph by pushing its button, driving for a mile
(or kilometer) and pressing again -- works for any tire size changes, etc.

Anybody know how to hook this puppy up, or where I could get some info?

Malcolm