Hmmm, I didn't think you could use a wide ban on a typical a/f sensor, due to electrical ability to read such fine voltage input within the gauge itself. (if that sounds right, haha)
Wide ban kits (gauge/data logging/sensors) have drastically come down in price this past year or so. Search honda-tech and you can find crazy good group buys on really nice setups. I would consider one with I ever decide to go with a piggy back setup for the saab. Dunno what my ecu plans are yet.
2004 Subaru Impreza WRX STi - Jave Black Pearl