CheeRS Gareth.

I'm not really sure what it wants to see, but I know that you can connect it quite happily to the Speed Signal wire on most Jap Cars, so whatever signal they give out is roughly what it needs. It was also quite accurate using the Ford Sensor.

Its nowhere near as advanced as Stack etc, you only calibrate it at 25mph, but thats plenty good enough for me. It was within 2-3mph at 160mph.

What I really want is a Magnetic sensor that picks up the Wheel Studs, I guess I will have to just try it and see.