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

What you have in your hand should be the cluster circuit board I posted. The wire colors, if you havenot chopped up the harness, are what you want. If you are unaware, the wire numbers are "X00" in other words letter plus numerals for the circuit, then 00X for the wire size in numeral and x for the color or XX for the color as in DBL for Dark BLue. or GY for Green with Yellow stripe

E2 20 O to the connector is circuit E2 and no 20 wire and Orange in color. That terminal is the feed into the cluster for dash dimmer controlled dash lamps. All of them are orange, AKA radio dial, cluster illumination, or shift quadrant, etc.