Abstract: A tachometer has a display responsive to an rpm signal for producing an observable indication of an rpm value. A circuit responsive to an engine input develops a standard rpm signal representative of instantaneous engine rpm, and a differential Power Band amplifier circuit amplifies the difference between the standard rpm signal and an adjustable “offset” rpm signal by predetermined gain to produce an amplified differential rpm signal. A switching circuit selects the standard rpm signal or the amplified differential rpm Power Band signal for driving the display. A peak or valley rpm signal may also be developed and selected for display either in a standard mode or a differentially amplified Power Band mode.

Abstract: A high performance tachometer is provided for use in high performance racing vehicles, such as dragsters. The tachometer has an input signal indicative of the vehicular engine speed and an output display for displaying the instantaneous engine speed as indicated by the input signal. The tachometer includes input controls for directing the control and operation of the tachometer. Special features associated with the tachometer include a shift indicator. The system is designed to monitor an engine speed or RPM profile and utilize information from this profile to operate the shift setpoint selection, shift display enablement and the shift indicator.

Abstract: A system for determining the operating characteristics of an energy source. The system comprises controller means for generating and shaping a time-varying voltage signal for application to the energy source; conversion means for receiving from the energy source a time-varying return voltage signal and for converting the time-varying return voltage signal into a digital signal. The amplitude of the time-varying return signal contains information representative of the operating characteristics of the energy source. The time-varying return voltage signal is produced in response to the time-varying voltage signal. The controller means is responsive to the digital signal and determines the operating characteristics of the energy source. The controller means generates display signals, and the display signals are representative of the operating characteristics of the energy source. The system also comprises display means for displaying the display signals.

Abstract: A high performance tachometer with memory device electronically connected to an input signal. A triggering device autometrically indicates the start of a drag racing event and activates the memory device. The memory device records only the racing event.

Abstract: A high performance tachometer for use in high performance racing vehicles, such as dragsters, is disclosed. The tachometer has an input signal indicative of the vehicular engine speed and an output display for displaying the instantaneous engine speed as indicated by the input signal. The tachometer includes input controls for directing the control and operation of the tachometer.