Abstract: The drawings illustrate a switch and latch arrangement responsive to vehicular odometer movement and including means formed at a predetermined location on one of the odometer number wheels, indicative of a predetermined cumulative vehicle travel, for pivoting suitable magnetic shunt means from a first position out of the path of lines of flux extending from a permanent magnet to a magnetically actuated reed switch to a second position in the path of the lines of flux, in order to selectively control an external device electrically connected to the reed switch.

Abstract: The drawings illustrate an odometer for vehicle use, including an idler wheel mounted adjacent the highest-order number wheel, and an endless strip of flexible material mounted around these wheels having a length equal to an integral multiple of the circumference of the highest-order number wheel. An array of indicia is formed on the strip for each rotation of the highest-order number wheel, and distinctly marked to portray, for example, that a second revolution of the highest-order number wheel is in progress.

Abstract: A vehicle road speed control system in which the engine intake manifold pressure and the engine exhaust manifold pressure are utilized on opposite sides of a servomotor power wall to control the engine throttle and maintain a desired constant vehicle speed. The intake manifold pressure is normally subatmospheric and the exhaust manifold pressure is normally superatmospheric. Within the usual operating range of vehicle engine loads, the pressure difference between the two pressures remains substantially constant and provides a more uniform pressure differential than that provided in systems in which atmospheric pressure is the higher of the two pressures. The intake manifold pressure has a control valve in the conduit leading to the servomotor which varies the value of the pressure difference delivered to the servomotor in accordance with a control signal generated by a comparison of desired vehicle speed and actual vehicle speed.

Abstract: A plurality of on/off sensors each register the occurrence of an event in a system while other sensors measure the value of certain conditions in the system and include detectors for indicating when any measurement attains a predetermined value. An actuating circuit responsive to the on/off sensors and to the detectors controls a display device which presents to a display location a message corresponding to an on/off sensor and an indicia corresponding to a measured condition. A meter has an indicator at the display location for registration with the indicia. The actuating circuit in response to detection of a measured condition of predetermined value selectively connects the sensor measuring that condition to the meter so that the indicator registers with the displayed indicia to indicate the value of the condition.