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Ur one.....
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It won't help you as far as tuning but it does tell you if you're rich or lean. It's not 100% but it's close I think. You can also see it switch from close loop to open loop mode(wide open throttle).

My factory o2 is wideband so it was useless but in open loop mode I could tell it was rich. But I get a lot more info from my wideband gauge and it's essential when tuning.
 
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