Okay so I was getting ready to do all the wiring mods from this guide for my 5 speed swap to be completed and get rid of my CEL (on a 98' 240):
S14 5-speed Transmission Swap - Electrical Connections
Started on the reverse lights, found the third connector down:
Decided to follow it down so I could just cut the two wires I needed to cut closer to the reverse sensor and find this:
Wtf? What do all the other wires go to? I think I may have found out why I'm getting so many weird codes maybe?