| Steve, it was mounted on the drive shaft with a hose clamp.  Mine worked
great, used it for years on cars I had in school.  
Larry
Steve Laifman wrote:
> 
> Electronic speedo based on drive-line pick-up?
> 
> Seem a little familiar?????
> 
> Back when they were just offering "Cruise Control" as an extra cost car
> option, good old Pep Boys had a bolt-on unit that used magnetic sensors
> mounted on the brake drums or drive line (I forget),  connected to the
> electronics needed to sense pulse rates to their little black box.  It
> had a mechanical output that modulated throttle position.  About '60's
> era, just out of vacuum tubes.
> 
> Steve
> 
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