Ive got 4 on mine

i use the Ifm efector sensors (IE5238 IIRC)........the best IMO.
All of mine are setup so that they use the rear of the wheel studs as the signal.

Best used as they are on M8 sized so nice and small.

Ive also got the bigger M18 Mag proxy for the speedo.........

If you need any more help....just shout