A/F Ratio
Having installed an A/F ratio meter (with similar LEDs), I can say that's it nearly worthless.
This was on an '03 Evo -- the LEDs would be consistent only in open loop: cold start or full-throttle. The closest use was A/F at full-throttle, full-boost (in those driving situations, a quick glance) to see if a lean situation was apparent (rare if ever).
Otherwise, the meter bounced back and forth under normal operation.
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“If we knew what we were doing, it wouldn't be called research” ― Albert Einstein
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