Wideband air/fuel gauge
A wideband afr gauge displays the exact air/fuel ratio, and is suitable for all fuel types. Regular narrowband gauges only show a stoich, rich and lean conditions, but due to the narrow measuring capability of a narroband sensor, they dont tell you how lean or rich the mixture is.
The wideband unit is ideal for cars with a tuned engine. It provides valuable information and will sometimes save it's value preventing an engine break. The Vems combines a wideband with an exhaust temperature gauge.