Air/Fuel gauge not working in 1.8 Sentra
 

I was wondering if anyone had a Air/fuel gauge in a 2004 1.8L sentra? If so what wire do I hook it into in the front O2 sensor? Some people with a spec told me the black wire. So I did and the gauge still doesnt work. I only have one little green light, showing that i have power to it. Can Anyone help me please?