Review on Optimized Auto Meter 4375 Ultra-Lite Electric Air Fuel Ratio Gauge by Eric Pavelko

Autometer makes very good quality sensors. This sensor is no exception when it comes to build quality, but unfortunately the narrow-band AFR (air-fuel ratio) sensor isn't very useful. It connects to the car's standard oxygen sensor, and as a result you'll see a constant back and forth movement from full rich to full lean on the sensor. You get a nice light show but no useful information. Luckily, Autometer will be releasing a wideband AFR sensor soon, which will include a Bosch wideband oxygen sensor. This setting provides useful information. Until then, skip this narrowband setup and save money for something useful.