Methods, systems and circuits for analyzing the performance of a vehicle having an electrical system are provided which determine a shift point while the vehicle is being driven. The map positioning system has a rectangular or X-Y drive having a map support surface coupled thereto and receptive to a map. The first switch and the second switch are connected in series to each other and are connected across the first cell and the second cell. Hollow cylinders opposed to the respective light-receiving elements inhibit lights other than the reflected lights reflected by the reflectors from being incident on the plurality of light-receiving elements.