jsidik New member Oct 12, 2009 #2 So, I got a gauge to monitor my air to fuel ratio, and the instructions say to hook one wire into a wire from my O2 sensor. My question is which one. If I remember correctly I have 3 or 4 on my wrx.
So, I got a gauge to monitor my air to fuel ratio, and the instructions say to hook one wire into a wire from my O2 sensor. My question is which one. If I remember correctly I have 3 or 4 on my wrx.
