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not change - add - a wideband o2 sensor. it's pretty standard tuner kit - sends signal to an afr gauge, datalogger, etc. typically use bosch units so threads are universal - check you exhaust for a spare bung (preferably before the cat). if not a permanent install you could probably just install in place of a post-cat o2 sensor and put up with an emissions code for a while. plx devices also make a unit that has a narrow band output so that you should be able to install in place of an oem 02 sensor.
this will give you wot afrs. however, if your trims aren't too out of whack when running closed loop then it is a safe assumption that you're ok open loop.
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