Engine speed indicator

Details Engine speed indicator Engine speed indicator

1978-12-11

1980-09-23

Tokar, Michael J.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

315179, 324402, G01P 336

Patent

active

042245702

ABSTRACT:
An engine rpm sensor utilizes a gas filled lamp for connection to a circu including an engine ignition system and a spark plug. A light pipe is exposed to the lamp and couples an optical signal each time a spark plug is fired to a remote location for utilization in a display or indicating device.

REFERENCES:
patent: Re22572 (1944-11-01), Miller
patent: 1536808 (1925-05-01), Norden
patent: 2068147 (1937-01-01), Miller

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