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

There are a couple of brown wires in the engine bay and they have confused some owners. One is ignition and the other is washer pump.
Only 1 gray wire in the engine bay and it is oil sender. Only 1 purple wire and it is temp sender. You'll find several blue wires. All are branches from the same switched 12 volt source.