Newell Gurus

Clarke and I recently replaced the alternator on my 84 Classic  (6V92 DD) at Tom's place. (Will post more about that later.) Since then the speedometer and the odometer quit working properly. The speedo needle vacillates around 15 to 20 mph around the actual speed and the Odometer has quit moving at all. Is there ANY possible connection between the gear driven alternator and the odometer and/or the speedometer? It is a rebuilt Leece alternator.

Not sure about the Classics but my 1992 speedometer/odometer is driven electrically by a sensor on the driveshaft just forward of the transmission.