Engine bay wiring pics

CRUZE 418 said

There are 3 harnesses. Wiper motor, engine ( coil, oil pressure, water temp and alt) and front light harness( ballast resister, brake dist block, starter relay, headlights, turns, and horn. Your pictures are difficult to see, but look typical after hacking.

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it sounds like the small section I am talking about is the ‘ engine ‘ section. Coil eng temp oil psi and alt. I will be using a aftermarket three gauge set up so I am not to concerned with the idiot lights . Which is the coil , and alt wire ? thanks
Which do I need to set up a MSD style ign box ?