Im tring to get everything together that I will need for my nitrous installation, and I am debating getting an A/F guage. I thought that the oxygen sensor reads the oxygen content, and nitrous will add oxygen molecules to the system, giving false reading, but Im not sure if that is actually what happens. Does anyone here know the answer? Thanks

 

You're better off with an EGT gauge. The stock narrow band O2 sensor doesn't react quick enough and might not give an accurate reading.

 

I agree with Phuong. In my research, both reading and talking to various NOS, SC, and Turbo owners of various makes of cars, I've determined the AF guage is basically useless when it comes to telling you about impending disaster. An EGT guage is what I've been told by everyone is the more effective of the 2, it's what I'll be running with my nitrous, which shipped out today by the way hehe.