Join Date: Aug 2006
Location: Chicago, IL, USA
Right. The magnet passes by a hall effect sensor that changes voltages with the passing magnetic field.
These voltage "spikes" are what most units pick up and translate into "speed" units.
Now most of the time, the hall effect sensors only generate low voltage signals. So in some devices, they use IC chips that only accept 5V or less. Applying a 12V signal to these chips will possibly fry them.
Other devices that are built with IC chips that take up to 14V are compatible with both inputs.
Like I said, it will depend on the sportvue's circuitry. But I agree with the previous poster, it would be best if you could just tap off the ecu GPS signal pulse. No epoxy, no worrying about mounting the sensor, no worry about it coming off.
But if you ask me, I'd think about mounting it on the drive shaft. Maybe pop open the final drive and slide out the drive shaft. Epoxy AND safety wire two magnets (to keep the driveshaft balanced) to the shaft. Then fabricate a mount to sit inside the swingarm and drill a mounting hole through the swingarm itself. A lot of work...