Air/Fuel Ratio Gauge!!!!!!

I just bought a Air/Fuel Ratio gauge and its instructions aren't user friendly could anyone help me wiht this? What wires do i hook it up to besides Ground/Power

Okay, in front of your engine bay, right in front of the foward valve cover, is a gray cannon plug with three wires running into it. If you trace these down you will notice they go to one of the O2 sensors. You want to tap into the center wire, which is white and has extra electromagnetic shielding around it. The autometer guage is not very accurate. You will notice while driving around that the meter goes rapidly back and forth, as the Ecu is always trying to adjust for lowest emmisions. however, at WOT, the meter should be in the middle to far end of the green, unless your boosting or running nos, at which point it will be a little lower. good luck. :D