Pinouts for the Gauge Cluster Harness:



This is the standard cluster in the '72 and '73 (74 - 76 are similiar):

Front:



Back:



The Gauges and Optional clock:



It should be noted that the same printed circuit connector is used appropriate to the year groups, a '72 and '73 standard cluster would not be "plug and play" with a '74 and later cluster.