I need help finding the wire that goes to the pin on the manifold near distributor...

Hey, everybody. I was wrapping my harness in wire loom and lost the wire that goes to the pin on the rear of the manifold next to the distributor. I assume it's a ground, but honestly have no idea what it does. I have one wire that could be a possibility. and it's grey and maybe coming from the ignition control module or ballast resistor. It's grey and is over by the passenger side bank of cylinders.

I'm a visual learner so some pics would really help me. If you have exposed wiring, that would also be a huge plus. Thanks!