Air/fuel ratio gauge wiring

[cornclose]

I read the narrow band sensor via obdii and have a gauge for it (amongst many other things) on my car pc. The instantaneous value does indeed vary, as it should, but I also have an average value displayed of all instantaneous values taken so far, and another showing the average of the last 100 samples. This gives me the best idea of what's going on, and if I need some other indication, I can add it.

Car pc - it's the future!