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is your o2 sensor wideband? if not, you can't tune...

what are you tuning? aem, map-ecu, or just fuel controller? for anything more than a fuel controller, your best bet will be a dyno, not the street. it's very hard to get the right load consistently...

if you do intend to tune on the street, i'd suggest getting a wideband that supports data-logging. it's also very hard to watch minor differences in A/F on a 4th gear pull... (and then remember everything.)
 

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what kind of o2 sensor are you using? the gauge can only be as good as the o2 sensor.
 
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