Are all O2 sensors the same? Can any generic Air/Fuel Gauge work with them?
No. While most are the generic type with a 0V-1.0V output range, there are certain so-called “wide-band” sensors that produce a much larger voltage output. Note: the “wide-band” term is a misnomer, as it should really be called “high dynamic range” instead (“wide-band” is a communications term that refers to the amount of information that can be transmitted over a particular signalling channel). Anyhow, the S-AFC will only work with the generic 0V-1.0V type.