I HAD SO MANY RESPONSES ON THE LAST PROBLEM, I AM GOING TO TRY AGAIN, THANKS!!!

I HAVE A 69 CHARGER WITH AN A-833, IT WAS ORIGINALLY AN AUTO. I BOUGHT A WIRING HARNESS AND NEW TRANNY SWITCH FROM PASSON OR BREWERS, DON'T REMEMBER WHICH, TO WIRE MY REVERSE LIGHTS. THE ONE END IS OBVIOUS, IT GOES TO THE TRANNY SWITCH, THE OTHER END HAS 2 MALE SPADE LIKE TIPS AND 1 FEMALE SPADE LIKE PLUG. THIS HARNESS IS NOT VERY LONG! WHEN I CALLED THEM BACK TO WIRE IT THE GUY I TALKED TO SAID TO REFER TO THE FACTORY WIRING DIAGRAM, WELL I HAVE IT ON CD AND THE ONLY THING I COULD COULD COME UP WITH IS B12, BECAUSE THE WIRE IS BLUE. I HAVE TRACED THE WIRE FROM THE LIGHTS TO THE DRIVER KICK PANEL, THEN GOT SIDETRACKED. THERE IS A HARNESS THAT USED TO GO TO MY AUTO CONSOLE (LONG GONE, BEFORE I GOT THE CAR). DOES IT GET WIRED TO THAT PLUG, DOES IT GO TO THE FIREWALL? THERE ARE NO WIRES BY THE TRANNY AT ALL, SO IF THERE WAS SUPPOSED TO BE THEY HAVE BEEN REMOVED FROM ONE OF THE PREVIOUS OWNERS. SEE WHEN I GOT THE CAR THE 4 SPEED WAS IN THERE VIA A HOLE IN THE FLOOR, NOTHING WAS DONE RIGHT OR FINISHED. BUT I WANTED THE 4 SPEED, SO I WELDED THE HUMP IN AND AM TRYING TO GET EVERYTHING WORKING PROPERLY. ANY HELP WOULD BE GREATLY APPRECIATED. THANKS IN ADVANCE