Thinking about it, it shouldn't matter where on the wheel you put the sensor, you will always get one pulse per wheel revolution.Yes it would have to be total trial and error, if I don't know what the default setting is I've no chance. By that for instance I mean the centre of the sensors needs to be 200mm from the centre of the wheel for it to work as per its calibrated setting...…
I don't like trial and error on expensive parts.....meaning the car not the speedo...…...The struts and hubs still make my eyes water cost wise....
What needs to happen is the speedo needs to be adjustable to accept differing numbers of pulses to register any given distance!.