RB25DET lower harness has extra plugs and wires?

[KPNITRL]

Hi, thanks for clicking.
So I'm in the final stages of wiring my RB25 into my S13 and I am totally at a loss with some extra plugs. I tried posting this on another forum but surprisingly didn't have much help. I hope some of you RB pros has some insight.

Im using a KA harness and the plugs off of the RB25
On to the pics.

So at the back of the harness there is the RB VSS plug that I need to transfer to the KA harness right? Well I dont know where or what to do with the other two plugs that are at the end of the RB harness (pic below)

Because at the end of the KA harness this is it


Then on the alternator side of the RB harness there is an extra brown plug that plugs into the AC I believe, but none on the KA. I plan on running AC so I figure I would need this plugged in, no?

What the crap are these for? Again off of the RB harness. According to what I found, the square plug has some wires that are coming from the back of the harness. One color that stood out was a green with an orange stripe which I thought was the neutral something or other, I figure this is important as well.

Again, thank you for any help. I tried looking online for a while and the best I could find was from RaceBread (awesome site) But didnt really answer some of my questions.