Proper engine tuning is essential to achieving maximum performance and avoiding costly, premature engine failure. Get the most advanced, user-friendly measuring technology in the industry. FAST air/fuel ratio meters can eliminate the unknown, allowing you to tune carburetor jetting and EFI profiles with confidence and complete accuracy. Features include: * Built-in data logger with on-screen playback, outputs for external data loggers and digital gauges * Narrow-band simulator function * Lighted, full-graphic display makes them easy to use * Available in a single-sensor version or a dual wide-band O2 version that can manage air/fuel in both engine banks simultaneously, or average them together for precise tuning

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