Chevrolet Citation/Omega/Phoenix/Skylark 1980-1985 Repair Guide

HEI System Tachometer Hookup

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Fig. Fig. 1 With coil-in-cap HEI distributors, connect a tachometer as shown



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Fig. Fig. 2 HEI external coil tachometer connection is opposite the BATT (B+) terminal

On all 1980 models and all 1981 models with the V6 engine, there is a terminal on the distributor cap marked TACH. On all 1981 models with the L4 engine, there is a terminal on the ignition coil where the brown wire is connected. Connect one tachometer lead to this terminal and the other lead to a suitable ground. On some tachometers, the leads must be connected to the TACH terminal and then to the positive battery terminal.


WARNING
Never ground the TACH terminal; serious module and ignition coil damage will result. If there is any doubt as to the correct tachometer hookup, check with the tachometer manufacturer.

 
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