I am trying to salvage a 1978 Cruise wagon. I have most things back together. Behind the fuse block there are two rectangle connectors that are just hanging. One connector is black with 4 slots and has a red with a white tracer at one end and (2) black with a white tracer wires at the other end. What is it for and where would it go? The other connector is red with 4 slots, 4 wires. (1) Red with green dots, (2) green with yellow tracer, (3) black, (4) brown with green dots. I thing it is for the tachometer. Where does it plug into? I have a 1978 wiring diagram but it does not match what I have in the car. Any help would be gratefully appreciated.