Mystery connector

[70barracuda]

Trying to cleanup the wiring in my engine bay for the LS swap and also trying to find out what stuff does to see if I can use it. This connect is on the pass side. So far the only wire i can trace is a couple from the a/c relay and one wire that I got tach signal off of. Does anyone have a pinout of the connections?  Diagrams haven't been great

[thecodemonk]

Based on your description, it may be for the A/C pump (when to engage the clutch when you want A/C but also to disconnect the AC clutch at high RPMs to prevent over-running it).