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Message: <blockquote data-quote="vermilion" data-source="post: 862787" data-attributes="member: 9891"><p>the o2s of the car are supposed to be accurate. however, i found that having a secondary wideband that doesnt rely on the stock computer gives a proper reading. i for instance have the FAST dual wideband meter. it was costly. <a href="http://www.summitracing.com/parts/FST-170402/" target="_blank">http://www.summitracing.com/parts/FST-170402/</a> this instrument has let me accurately read how my stang is doing. i throw this info alot out there but it is bar-none helpful... actually the SCT is accurate also but if you datalog using the tuner to laptop you can get what your pcm interprets. using an analog meter with the SCT is also a good learning tool. many people have successfully used it.</p></blockquote><p></p>