To zero an odo, pull the speedo, there are several black plastic geared number wheels with a grey diecast one to the left, with a tooth pick or drill bit (blunt end) push out the shaft supporting the numbers from left to right (to disengage the grey wheel) spin the numbers around to 00000 push the shaft back in ( right to lrft pushing the tooth pic/drill bit out). Job done. Good luck, remember it is, in theory, illegal to zero an odo, but you have been warned. Beaner7102