At 02:02 PM 7/28/2014, Ralph Meyermann wrote:
>Don't know how common or interchangeable the O2 counter was on other VW
>applications, I figured it could be a simple set up for multiple vw's

It likely was, but it was designed to close a switch after N thousand
miles, not operate a speedometer.  The gear reduction is orders of
magnitude too high.

Yours,
David