SKU: FST170401
UPC: 036584133469
MPN: 170401
The FAST ELECTRONICS Air/Fuel Meter (part 170401) is a single-sensor air to fuel gauge built for engine builders and tuners who need accurate combustion feedback without dragging a laptop to the track. It reads from a single wideband oxygen sensor and displays the air/fuel ratio on a lighted, full-graphic digital screen. The kit works on gasoline engines, both carbureted and fuel-injected setups, making it a practical tool for naturally aspirated builds, blower cars, and forced-induction swaps. For shooters who also wrench, it slots in alongside the rest of our gauges and accessories selection.
Built-in data logging is the standout feature here. The 170401 records runs and plays them back on its own graphic display, so a tuner can review what happened on the last pass without connecting external hardware. When a laptop or standalone logger is wanted, the unit provides outputs for external data loggers and digital gauges. A narrow-band simulator function lets the meter feed a factory-style signal back to engines that expect one, keeping the original signal compatibility intact during tuning. The single wideband sensor ships with a 12-foot cable for flexible mounting, and the whole system runs on 12-volt power. The unit carries a C.A.R.B. Exempt designation per the manufacturer's listing. Pair it with a matching air/fuel ratio monitor for a complete readout.
Reach for the 170401 when dialing in jetting on a carburetor, verifying fuel curves on a fresh build, or checking for lean conditions under boost. The internal logging makes it useful at the strip or on a dyno where you need to capture a full pass and study it afterward. Mount the wideband sensor in the exhaust, route the 12-foot cable to the display, and you have live and recorded ratio data in one box. Builders running a full instrument cluster can round things out with a digital wideband gauge or browse the broader individual gauges lineup.
Yes. The 170401 is compatible with gasoline engines in both carbureted and fuel-injected configurations. It reads the air/fuel ratio from a single wideband oxygen sensor, which makes it a useful tool for dialing in carburetor jetting as well as checking fuel curves on injected setups.
No. The 170401 has built-in data logging that records runs and plays them back directly on its lighted graphic display. If you prefer external recording, the unit also provides outputs for external data loggers and digital gauges.
The narrow-band simulator lets the meter output a factory-style signal to engines that expect a stock narrow-band sensor input. This keeps the original signal compatibility intact while you tune with the wideband sensor, so the engine management still receives the signal it looks for.
The kit includes a single wideband O2 sensor with a 12-foot cable, giving you enough length to mount the sensor in the exhaust and route the lead to a dash or remote-mounted display in most vehicles.
Per the manufacturer's listing, the FAST 170401 carries a C.A.R.B. Exempt designation. Always confirm current requirements for your specific vehicle and jurisdiction before installation.
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