Vehicular transmission sensor apparatus responsive to gear selection

An internal mode switch for use with motor vehicle transmission apparatus having a detent lever with a plurality of detents formed on an outer edge surface thereof, each detent corresponding to a specific transmission gear selection, the detent lever being pivotable about an axis, a roller, means to mount the roller so that it is movable toward and away from the axis and bias the roller toward the axis, means coupled to the roller including an elongated member having first and second ends, the first end mounted on the axis, the second end having bifurcated generally parallel arms with the roller received between the arms, the motion of the roller toward the axis being limited by the outer edge surface of the detent lever, a cam plate mounted on the detent lever and movable therewith, switch means mounted on the elongated member, the switch means having first and second electrical contacts movable relative to one another between contacts engaged and contacts disengaged positions, follower means extending between the cam plate and electrical contacts, the cam plate causing the follower means to move toward the electrical contacts at a selected angular position of the detent lever to cause the contacts to move into a contacts engaged position and the follower means moving away from the electrical contacts at other angular positions of the detent lever to cause the contacts to move into the contacts disengaged position, and means for electrically energizing the switch and for outputting a signal therefrom corresponding to the respective contacts engaged and disengaged positions.