On Mon, 9 Jan 2006 15:00:37 -0000, "Barney"
wrote:

Yes this is three wire too, but with a 12 volt supply - I think they usually
have a voltage regulator, so that the supply voltage can be anything from
about +3 volts to +24 volts. If the output is roughly a square wave from 0
to +5 volts I should be able make a simple tester for it quite easily.

Nice thing about it is you can slowly turn the engine and watch it
turn on and off with a meter or use a magnet . . .

No reason it can't be a 12 volt switch. My truck is old and the speed
sensor just goes into the "computer" which probably has a 5V regulator
built in.
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