An apparatus disposed in a speedometer-odometer drive assembly for transferring and translating the rotation of a speedometer drive cable to a speedometer needle registering speed and an odometer registering distance, having a field cup disposed at one end of a drive shaft in communication with the speedometer cable and rotatable about a central axis with this shaft. The rim of the field cup is discontinuous at at least one point about its periphery by virtue of a cut or split being upset with respect to the radial plane of the surface of the field cup rim. These cut or split edges of the field cup rim act to engage successive threads or teeth on a gear means driving the odometer as the field cup rotates. A flux cup is inserted into the field cup to cover a magnet mounted within the field cup. The flux cup responds to the magnetic field created by the rotating magnet, thereby driving said speedometer. The gear means driving the odometer comprise a camming means fixedly mounted on a face gear. A cam follower translates the rotation of said camming means, caused by the engagement of the field cup rim with the face gear, into oscillatory motion of a drive arm, which causes the successive engagement and disengagement of a gear-engaging means to rotate the odometer drive means in one direction only.
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