FAST™ has revolutionized the tuning industry with its wide-band air/fuel meter. With no laptop required, FAST™ has developed three simple, user-friendly air/fuel meters for gasoline, diesel and ethanol/methanol (E85) fuels. Available in single or dual sensor units, these meters give tuners the power to read two wide-band O₂ sensors individually or average them together for maximum accuracy.

• Built-in data logging capability plays back recorded information on a lighted, full graphic display screen

• Shows your current Air/Fuel ratio in real-time, eliminating the need to download to a separate laptop computer

• Features outputs for external data-loggers and digital gauges

• Narrow-band simulator function feeds your engine's computer a factory signal while using the wide-band sensor for air/fuel measurement