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

I would NOT ground to the same point as the main large battery ground cable. Any convenient bolt into the heads / intake/ block will work. Coil mount, even a carb stud. Also look at the front of the pass side head. Those bolt holes are on the rear of the driver side head. Be carefull they are shallow, l"stick" them to check depth