Hi new here hope someone can help have a 2006 silverado ss and trying to hook up a AFR gauge but i do not know witch wire is the O2 signal output wire coming out of the ecu can someone help thanks!!!

 

What brand gauge are you trying to hook up?
Sounds like you are trying to hook up some kind of narrowband gauge to read off the factory sensors. If that is what you are doing then it's really kind of a waste of time since a narrowband can't give you an accurate afr reading at WOT where you need it most.

 

Hay Ryan the gauge is a prosport don't really care about the accuracy just want it to work that's all can plug into the obd port
for the accurate reading so if you can help me with this would really appreciate it