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the dashdaq alone is too slow to read AFR's properly, OBD II isn't designed to supply data that quickly, but thats irrelevant anyway since the AFR's can't be read by the OBD II anyway, you can monitor LT/ST fuel trims which will tell you if theres something amiss.
you're better off with something that adds a wideband at precat then logs that, the dashdaq can log from the zeitronix and the innovates and a few others, that'll allow it to data log faster.
If you only want AFR's just get a stand alone gauge like the AEM, they have 0-5V outs and some have rs232 outs too, since they're still in the 1970s.
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