Thread: Harness question

I have a 98 nissan 200sx and i have a question about three plugs on my engine harness that i am wondering about. I dont know what connects to it. and also i would like to know what all is required for proper a/c installation due to when i bought the car the a/c wasnt installed but included some pipes and thats all. i will attach pictures of the wires.

Anyone have an idea?