Auto Meter Products, Inc.

John V Westberg

Timothy D Joyce

Karl G Rindt

Brian S Martens

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 &ldquo;offset&rdquo; 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.

Dual range tachometer

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.

High performance tachometer having a shift indicator system with

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.

High performance tachometer with automatic triggering

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. Special features associated with the tachometer include a memory device configured to store the value of the input signal at periodic and discrete time intervals, as directed by the input controls; a special event detector configured to detect a certain predetermined event or pattern of the input signal as determined by monitoring the output of the memory device, the special event detector being further configured to halt or freeze the output display (both deflection needle and digital readout) upon detection of the predetermined event or pattern output from the memory device; a multi-stage RPM switch is included to operatively control a plurality of controlled devices. The system is designed to allow the user to program the RPM switch to operate the controlled devices at a plurality of engine speeds. In addition, an automatic starting feature is provided. The automatic starting feature of a preferred embodiment is initiated in connection with the activation of the Line-Loc switch.

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Kingston, IL, United States of America

John V Westberg