Wide band O2 vs narrow(?) band O2 sensor?

Well now I'm all fuckered up. I thought these were the narrow band meters. I'm using a single wire O2 sensor with them (I have two, one in each car). It's been a great tuning aid in the 240z. I have it tuned so that at idle and cruising I'm almost on the lean side of stoch and when I drop the pedal it goes full rich. Car runs great too. I tell you though, before I put it in, I was chasing my tail trying to tune this thing. It has been a sanity saver.
 
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