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The AEM gauge with the wideband controller has an RS232 output for datalogging, and the standalone controller does also. IIRC the software is available on AEM's forum. Their website is a horribly unorganized pile of shit by the way, and they don't post manuals for anything except in the forums (and they're hard to find there also)..
Actually, the AEM stuff may require hyperterminal or something, I don't remember. I've never really recommended the AEM stuff because there are better units on the market for less money (and they come with nice display software)..