NSS harness carnage!

Hi, i have a 72 Plymouth Duster. I'm working on my NSS harness now. It is on an auto trans. My harness is good from the transmission up the the 3 prong connector that plugs into the bulk head, but i can not find the plug to plug the NSS harness into. Any ideas or anyone have a 72 that could tell me where its normally at or where to look. It would help tons.
Any suggestion or ideas.!!!
Thank you.!