IAP isn't quite so easy, its the SAP (barometric sensor under seat) and map sensor interacting together to come up with a difference that is corrected to altitude. There are formulas posted on sh.org and ecu hack forum for the gen 1's, though i dont think they apply. Easiest way to get yourself close, assuming you are going to be tuning at the same elevation all the time would be to take a voltmeter and measure voltage with engine off, then voltage at idle, all while watching the IAP map on the screen. If you see a number of 40 at a voltage of 4.2 volts and a number of 0 at 0.9 volts (completely bogus numbers i am spouting off) thats enough info for a 2 point calibration. Then watch ecu editor screen and dl32 screen at the same time to make sure they line up.
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