The sensor is a coil, reluctance sensor, the passing of the teeth over the end induces an AC current in the coil.
I am not sure. I did the same with a scooter's WSS and it was an active two wire magnetoresistive sensor.
I remember when I tested the KTM sensor I get an infinite resistance (I will confirm it in a bit).
Doesn't the big KTM have a CAN Bus? If yes you could grab many things from there.
You are right there is a CAN Bus with a diagnostic plug. I think it's not so easy to grab information from the BUS. If you find someone ables to do it, for sure he will fin thousand of friends on KTM forum.
Before buying the 1290 I had a KTM 690 and I used TuneECU to customize the injection map, .... I thought the soft will be compatible with the 1290 but no way. It seems that KTM engineers have strengthened the communication security.
I'm actually in project to hack the CAN bus of a KTM; and for the moment I'm able to visualize the data in my arduino IDE, and Im able to find also the relative data provided by the wheel speed sensor . But as you I don't found the datasheet of the hall effect sensor so I don't knew what exactely the data means; so if you have found the datasheet please share it if you can; it will very hekpful ;