Wiring

Not my picture, I stole that from Moparts a while back.

The left comb is for a cable shift, so '65 and down. Center is '66-'68. Right is '69 up. That just identifies the NSS part and there may be other nuances that affect how they interchange. I read that the right one is actually a '71 and there's a slight difference in the shift detent between that and a '69-'70. If that makes a difference, I really don't know.
Another question ❓. How many volts runs the dash lamps? I only have have two dim lamps above the dash and want to add led lamps. If I plug the harness across the battery with 194 bulbs, I get nothing. I know they work. If I plug in the 2 led bulbs, the wiring gets hot.
 
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