[Huw Peplow]

The old rf gave a speedo sensor connector and a smiths electronic speedo to work with and so far i have failed to get it working any helpwould be appreciated

the audi sensor creates 4 pulses per revolution picked up via the sensor which is either of the type magnetic or hal/ecu (what does hal mean?) On advice I used the hal terminal but I am uncertain if this is correct as Its probably magnets producing the pulse.

the smiths speedo has eight connections on the rear
1. ignition+ve
2. reset switch (not used)
3.pull up/down if required (what is this?)
4.illumination
5.chasis earth
6.speed pulse input hal/ecu
7.speed pulse input magnetic
8. not used

so far i have used 1,4.5.6, and speedo measures nothing even when coded corectly to 3129 pulses per mile.

I realise that other sensors have been used on the drive shaft but a few people have got theirs to work normally with out addition Noteably Jerry in uk but his memory is a little vague as to exactly the way it works and although I have coppied his instructions its failed

Any idea how to measure the pulsesfrom the sensor, volts etc and as I see it one side sensor is an earth connection the other is the out put to speedo

some electronic genius out there must be able to help