I see the 18or/bk wire but I think thats mounted on the front of my engine. I unscrewed the 3 prong outlet in question and it goes into the same chamber as the oil pressure sensor.
The oil pressure sensor has one white wire going to it reflected in the diagram . And the 3 prong connector in question only utilizes 2 prongs, red/pos and blue/neg, these were the colors it had before and I kept those colors after. Im simply not finding it on the diagram.
I'm going to continue with the other final things and worst case scenario I just try to start it without that connected.