O2 sensor hookup

[FlyBoy]

First post !!

Hope you can help me out here. Did not get a response at another forum but saw that there are some people here that know a lot about electrical (Magnes/NISTECH?).

I was trying to hook up my narrowband A/F gauge to the secundary O2 sensor from my 2005 350Z. It can not be done to the primaries, because that is a wideband.I was expecting a .4 - .6 Volt readout from the black wire, but it is a steady zero. Is this because the sensor first has to reach a certain temperature or is the secundary sensor only working if the primary fails.

Anyone??

Thanks

[elwesso]

the secondary o2 sensors are only there to make sure the cat is working. You will NOT get an accurate AF ratio that far downstream!!!!!