Are you after some kind of universal fitting device?  A lot of cars these
days don't have speedo cables anymore, instead they use a sensor of the type
you need that give out a pulse train with frequency proportional to speed.

The old fuel computers (I have old "Smiths" device with an original GE PIC
in it!!) used a ring of magnets attched to either the prop shaft for RWD
cars or to one of the drive shafts on a FWD car, and had a simple inductive
pickup mounted on a bracket.  If you use this method it's important to take
into account any suspension movement that may either stop the sensor
working, or knock it of it's bracket!

Regards

Mike Rigby-Jones

> -----Original Message-----
> From: Wagner Lipnharski [SMTP:wagnerl@EARTHLINK.NET]
> Sent: Monday, July 12, 1999 3:32 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      [OT] Speed Sensor
>
> Does anyone knows some supplier for "speed transducer" to be installed
> at the car speedometer cable?
> My circuit needs to receive a frequency proportional to the car speed,
> and I need to find out ... well... cheap sensors... :)
>
> Thanks
> Wagner Lipnharski
> http://www.ustr.net