Help, 72 duster NSS/Back up light harness hook up.

Is your car an original Auto or Manual??

I just hooked up my nss the other day and the plug for a manual car is different and you have to splice the 3 prong plug that comes off the tranny into the 2 wire harness under the car. My reverse lights had not worked for 25 years and with splicing the wires in they now both work. Maybe crawl under the car and take a pic of the NSS on the drivers side of the tranny.