Wiring... Plz help

Good luck bruh.
Get the DIAGRAMS for both. Then you get to interpret.

The color codes on the diagrams will help, and they will show the plug types too. Find the component, follow the pretty lines to the plug, Chase same in the harness.

I.e. follow oil light wire on '72 diagram to it's plug, follow the oil pressure sender on the 70 diagram, and they gotta meet in the middle. Pick one thing at a time.