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I was looking for some info when I came upon this great guide for tuning piggy back fuel/ignition units like the MAP ECU. There is a lot of good info here, especially about how to use an OBDII scanner to look at the fuel trims to get your fueling right in closed loop. They also list a nice, cheap OBDII scanning adapter/program.
http://www.gadgetonline.com/U-Tune.pdf
http://www.gadgetonline.com/U-Tune.pdf