Engine Harness ?'s

[72 Cheyenne K20]

I got an engine harness I'm trying to put in my 72' automatic w/350 motor. I can't remember if the harness came out of a stick or auto.

1. There is a black wire (12 gauge) that comes out where the alt wires are. I got the rest of the alt wires hooked up but can't find where the black connects. The other end hooks at the rad support.

2. I've got an 18 light green wire and an 18 dark green wire that the wiring diagram says go to the back up light switch 4 spd. Since mine is an automatic, I don't need these right?

3. Dark blue 18 gauge that goes to the sw asm oil press. I have guages in the truck and I'm assuming this wire is for idiot lights? So I don't need it either?

Any help would be great.

Thanks, Scott