El Camino ZZ502 Factory Tach Install 1973 1974 1975 1976 1977 Monte Carlo Chevelle Malibu

This is an information video on taking a used tachometer out of a used cluster and  replacing the vacuum  economy gauge with it.  it requires pulling the entire cluster out, saving some parts from the donor cluster and running a tachometer wire to the HEI if your car did not have a tachometer to begin with.   the pin that is the tach wire to the distributor is the fifth from the right on the bottom when you’re looking at the cluster from behind. The economy gauge housing, will power the tachometer, but you must keep the connector tabs from the donor cluster to the tachometer.