Calculated road speed pulse

[Robsey]

I am working on the electrics of my missus' 1983 van, anyway we are looking at fitting a head-unit, which has external extra add-ons like sat nav and cd multi-changer.

My question is -

I understand that there are ABS configured vans, and just wondering how many "teeth" are on the toothed ring for the ABS.

I am looking at using the ABS square-wave pulses to drive the dead-reckoning system on the head-unit.

Many of these aftermarket systems used 29 teeth per rpm. Just wondered if the VW T25 had a similar number.

Also - I assume the ABS equipped CV joints / wheel hubs from the later ABS vehicles will fit the earlier models

I am going to be doing a total re-wire, so considering whatever extra wires and sensors need to be built into the looming whilst everything is stripped-out, cleaned, repaired, improved on and then re-assembled.

[bigherb]

T25's used AC sine wave signals from the sensors.

[Robsey]

The wave shape may not be too much of an issue, as long as there is sufficient difference between voltage at maximum (peak) and the minimum (approximately at zero volts ).
Afterall we are looking for a number of pulses, rather than pulse shape.

Do we know how many teeth are on each ABS ring. - Otherwise it may be a matter of finding a drive shaft mountable ring and ascociated sensor... as used on some basic Non-ABS Vauxhalls from approx 1999 onward.