Greg,
The way I read FT, there was a request to allow a wide-band O2 sensor and it was not approved by the CRB. I didn't see any qualifications on there to the effect of 'only allowed if used as a gauge'. I understand that gauges are free, but here it would seem that you've had a specific request to allow a specific item, that has not been approved. I would think that since it explicitly addresses a wide-band O2 sensor, that you're not allowed to use one, period, not even as a gauge. Therefore, I'm not so sure your contention that it (W-B O2 sensor) is allowed as a gauge is correct.
I'm also not so sure how it would be hard to police, even if allowed. You've got wire(s) from the W-B O2 sensor going to some gauge, if you've got wires going from anything that the W-B O2 sensor is connected to (gauge, data-logger, etc.) going to the ECU, that's pretty much a no-no. Not to mention that this was expressly mentioned in one of the CoA rulings:
If the use of a W-B O2 sensor was not approved (again, this is moot if that means it's not allowed at all, which is my interpretation), having it send a signal to the ECU would clearly be a prohibited function. Hard to police? I don't really think so. Cheating? Most definitely.The Court reminds everyone that per GCR 9.1.7.D. “No permitted component/
modification shall additionally perform a prohibited function.”
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