One pink/black wire will also connect to the reverse switch. I have also seen the pink/black wire as a part of the tach harness that plugs into the center of the under dash fuse block.
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey
1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles
2017 Sierra SLT 1500 Z71 4X4
2019 Canyon SLT Crew 4X4