So im alomost done with my first swap. I have a 90' dx. I am putting in a b16a, obdo. The wiring is just about done, my question is: what is the plug on top of the tranny, its grey and square-like. I am using my dx harness and adding everything for vtec and o2 sensor and knock sensor, ect. there are no other plugs like the one on the tranny. I cant find anything about this anywhere. Thanks for any info.