Sportster sport sppedometer problem

After jumping my 2000 Sportster with a large automotive type charger my speedometer, odometer, and turn signal cancelation quit working. I checked the fuses, cleaned the sensor, checked the codes. All codes were clear except 02. I could clear this one by holding the reset in for a few seconds but it would come back on when the key was switched off and back on. With me being the cheap individual that I am my next step was to buy a used sensor off ebay. No workee. Next was a new sensor from the dealer. Still no workee. Still couldn't clear the code. Next I jacked up the rear so I could turn the wheel and try to detect sensor pulses. It was while I was fooling with this that I cleared the code with the engine running and the wheel turning in first gear. No immediate results but the next time I started the thing all was well in Harley world. I now have 2 good spare speedo sensors. After jumping my 2000 Sportster with a large automotive type charger my speedometer, odometer, and turn signal cancelation quit working. I checked the fuses, cleaned the sensor, checked the codes. All codes were clear except 02. I could clear this one by holding the reset in for a few seconds but it would come back on when the key was switched off and back on. With me being the cheap individual that I am my next step was to buy a used sensor off ebay. No workee. Next was a new sensor from the dealer. Still no workee. Still couldn't clear the code. Next I jacked up the rear so I could turn the wheel and try to detect sensor pulses. It was while I was fooling with this that I cleared the code with the engine running and the wheel turning in first gear. No immediate results but the next time I started the thing all was well in Harley world. I now have 2 good spare speedo sensors.