The AEM Tru-Boost Boost Gauge/Controller combination is a multi-featured system for simplified, comprehensive boost control. Packaged within a 52mm gauge are a 29psi capable boost controller, peak-memory boost gauge, and many other great features. This unit includes black and silver bezels and black and white faceplates for simple color selection and easy matching to other AEM gauges (i.e. serial gauge, UEGO, etc.)