Aftermarket Rear Camera Revert to Factory Install

Hi, I searched and have found some helpful info on the forums but can't quite figure this out.

I put a aftermarket stereo into my 2014 Taco (no-jbl, no-nav). I was smart and bought a harness so I didn't have to splice the wires. However, when I installed my aftermarket rear view camera to the aftermarket stereo, I did end up pulling off an entire harness. Fast forward 2 years later and the Pioneer H.U.

$850 MVH1400NEX Pioneer MVH-1400NEX Digital Multimedia 6.2" Display with Apple CarPlay (Does Not Play CDs)

MVH1400NEX, had died---something internal on it. So, I'm going back to the factory radio.

Most of the harnesses went right back in. But I have one "group" of three factory wires without a harness that I'm trying to place. 2 of the wires were wired to an RCA that plugged into the aftermarket radio. The other wire - I'm not sure about. I also have a red wire that I installed coming from under the glovebox where I tapped into the power that fires when I put it in reverse.

Does anyone have any idea where I should land those wires? recommendations for if I should buy a new harness and where?

I appreciate your help. My wife says I'm a moron and I won't be able to fix this. Help prove her wrong. TY!