Chevy/GMC Truck 1967-1972 Classic Instrument PDF Installation Manual
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Determine Tachometer Signal STANDARD POINTS & CONDENSER SYSTEM Connect the negative side of the coil (usually marked as “-“) to the signal wire for the tachometer. GMC – HEI (High Energy Ignition System) Connect the “TACH” terminal on coil side of distributor cap to the signal wire for the tachometer.
MSD (Multiple Spark Discharge System) Connect the Tach post on the MSD box to the signal wire for the tachometer. If the tachometer does not
respond, your MSD system may require a MSD Tach adapter. Part No. 8910 or 8920.
