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Check my reply in your thread "engine light is on?", I give a link to some O2 simulators. You will probably have to call for price and availability for your exact application.
Just build one with a few parts from Radio Shack. 555 timer chip, a few resistors, diodes, and leds, and wire right in. If you are good a soldering, it will cost you about $5 or less. I use to build these all the time for my Civic buddies. Worked really good.