Holy s*** I hope you're good with a soldering iron and a multimeter.
Get to know this thing, it's about to become your new best friend.
https://www.nicoclub.com/service-manual ... 4%2Fel.pdf
It's quite tough to tell what we're looking at up so close, you're going to have to follow those plugs back into the harness, and cross reference with the Service Manual until you have a good idea which harness each of them is part of. Then use the location in the engine compartment along with connector shape to identify the plug. Wire colours will help a lot where the OEM wire still exists.
Fill in some more detail on your ride too, which engine, A/T or M/T? etc.