904 and 727 question

View attachment image.jpgI have a 68 valiant with 904 trany , I pulled the 273/904 out and installed a 360. With 727 trany , on the 904 trany on side there is a wire I would guess backup light. On 727 trany there is a black , orange, and green could I change the part in trany or what does my wire from harness hook to ? Picture is the 904