Noob question; Installing intellitronix digital gauge, (tw: LOTS OF DUMB QUESTIONS)

I will admit the 73/ later OEM diagrams can be difficult to follow. One thing you can do, is go to MyMopar and download say, a 72 manual, AND IT WILL BE DIFFERENT for wiring, but you can follow where the wiring goes and then transpose colors, etc. Some of the common circuits may be the same.