Ok, I have a moment more... You need a wideband in order to effectively and safely tune. If you do not have one and cannot afford one you should take your car to a TRUSTWORTHY performance shop for tuning. The system can only be tuned for open loop operation, if you want to tune the closed loop fueling you may remove the stock O2 sensor to force the ECU to remain in open loop mode, but aside from just being lazy when tuning there's no real benefit. I recommend just tuning the open loop levels unless you have a specific reason not to.
The most affordable wide band is the very reliable LC-1 by Innovate Motorsports. I've installed a number of these, tuned with them and have found them to have very little shift as the sensor ages; You'll find a number of magazine articles and owners praising this unit if you dig around.
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