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Your AFR gauge has an wideband O2 sensor. If your gauge is hooked to your factory narrow band O2, that is not an accurate means of measuring your O2 reading. If it is indeed a wideband, you should pull it from the exhaust and do a free air calibration on it, if applicable. Your wideband should be connected to the ecu for feedback, so the engine management can see what your AFRs are doing, should your ecu have some type of auto-tune feature.
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