Power to cluster 1973 dart
Okay, so I was right and your big red x wasn’t warranted. I said Exactly that. It shows which way current is flowing. Not sure why you x’d it or seem to be arguing the the same side of the same point I was making.
keeping it a little more simple and just answering the OP’s question, the power to the cluster is provided through one of the pins on the round 9 pin connector. Your full service manual will have wiring diagrams in it to show which colour and gauge wire it is. Sometime you can download these manuals online for free.
‘’good luck