> >On some cars I've seen magnets on the drive shaft
> >with a  pickup for the cruise control, but the
> >tachometer seemed to be driven from elsewhere.
>
> Well for cruise control, you obviously need to have the pickup after the
> gearbox. Same as for a speedometer.

Sorry, I meant to say speedometer.  I forget the exact model of car, but
it surprised me to see that the cruise control seemed to have its own car
speed pickup independent of the speedometer, even though the cruise
control was factory installed.  This was around 1996, and probably the
factory installed cruise control was really and add on unit slapped on at
the factory.  I assume newer cars have this better integrated.


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