Square air fuel ratio gauge, velcro anywhere, size of a keychain remote. Air fuel ratio Gauges help tune the a/f of your engine. air fuel ratio tunning will make more power! -
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Wide-band Air/Fuel Ratio (AFR) Gauge with Wide-Band Oxygen Sensor, Digital/Analog LED Display (AFRG1): Wide-band Oxygen Sensor Systems | Racetronix
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