Abstract: A display unit of a fuel consumption meter for an automobile, wherein a proper fuel consumption is determined and an actual fuel consumption is measured and signals corresponding thereto are applied to comparing circuit and bar graph detectors. The comparing circuit compares the amplitude to the signals corresponding to proper fuel consumption and actual fuel consumption, and the bar graph decoders, after decoding the signals into a format compatible with a bar graph display, transmits the signals to an EX-OR circuit and an OR circuit.

Abstract: A display unit of a speedometer meter for an automobile, wherein a desired car speed is determined and an actual car speed is measured and signals corresponding thereto are applied to a comparing circuit and bar graph decoders. The comparing circuit compares the amplitude of the signals corresponding to desired car speed and actual car speed, and the bar graph decoders, after decoding the signals into a format compatible with a bar graph display, transmits the signals to an EX-OR circuit and an OR circuit.

Abstract: A steering wheel switching circuit is provided which is capable of controlling component parts on a car body side through the use of a small quantity of coupling devices in cooperation with a controlling part by connecting a switching part installed on the steering wheel and two sets of series circuits installed on the car body part in parallel with a power supply. The switching portion includes a switch circuit having diodes electrically short-circuited across two terminals in both the positive and the negative direction. These two sets of series circuits have load resistances and switching elements with control terminals with the controlling part applying opposite polarity signals to the control terminals of the switching elements.