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Engine RPM Reference

The "R" terminal of the HEI module is used to send engine RPM signals to ECM.

NOTE: More sensors are used by the ECM to control engine performance and other systems. Refer to "GENERAL MOTORS COMPUTER COMMAND CONTROL SYSTEM" in Computerized Engine Controls section for more information.
Fig 1: Component Location for Camaro and Firebird
G09315799Courtesy of GENERAL MOTORS COMPANY