searched: pics of this wire...

Ok, ive searched everywhere, and get how to install my a/f gauge, but i dont know WHAT wire it is. Can anyone please take a picture of what wire it is? I want to plug it into my ecu, but I dont wanna risk messing anything up, so if anyone can just show me what wire? I kno they arent accurate etc etc I just need to kno if im running lean/rich with the nitrous so i kno how much i need to retard the timing and whatnot. And its like I said, ive searched it but cant find anything. Thanks in advance for any replies :slight_smile: