Don't know whether these pics will be very good, its lashing down with rain outside.

This should show generally where the sensor is fitted, its on the left fork leg only because the wire can then be fed up the brake line to the unit.

This shows the sensor and magnet fitted, I'm hoping to powder coat the fork legs black soon so the cable ties (if I use black) shouldn't show. I think all of the sensors are slightly different, the catseye one is the perfect size for this location.
The magnet is glued onto the rotor. I used Araldite "Best glue ever, better than anything else" I rode to Stratford on Thursday on the motorway (240 miles) and have ridden locally before I fitted the sensor and it hasn't budged.

Not a great picture but shows how near you can fit the sensor without it snagging anywhere.
Only fiddly bit was fabricating a cover for the speedo cable after I took it off.
Cheers
Chris