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

In your original post you wrote
"2. Additionally there is a youtube video of a gentleman who installed this gauge and he mentioned that he taped these two black and red wires together (pictured in mess.JPG, encircled in green).... I have a feeling that this maybe what black and red wires are supposed to connect to? For context I was not able to start the car until I taped those together.

I believe those 2 wires (black and red) are the connections to the original Amps gauge. You should not connect any of the wires from the new gauge panel here. I would nut&bolt those together and tape them up real good for now until you learn a little more. Don't let those accidentally touch any part of the dash frame either.