I found that the size of the harmonica connector for the gauge cluster changed around October/November '71 to the larger one. As said above, the position or the wires in the connector, as well as the number of wires/connections changed often so you would want to make sure the printed circuit you use on the gauge cluster matches the harness you use.
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'72 Formula 455HO TH400, Revere Silver, black deluxe
'74 Trans Am SD 4 speed, Admiralty Blue, blue deluxe
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