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O2 sensors are simply put thermal transducers, although a bit more complicated than that in reality. A thermal transducer creates a voltage based on energy input. The A/F LED guage uses a chip to determine where the voltage lies and lights a correspondign LED. The problem is that we have no idea how to accurately quantify what voltage we are looking at when the "orange" LED lights up. To further complicate this problem, we have would have to go an EXTRA step to correlate that o2 voltage with a tangible A/F ratio such as 11.5:1, which is a good value to tune for on the dyno. So when everything is said and done, the onyl thing those lights are good for is making you look cool when a ricer is pulled up beside you! =)
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