AEM 30-4350 Tru Boost Gauge Type Boost Controller. This electronic boost controller combines boost gauge and controller in one smart package. The controller is the same size as a boost gauge, but has the ability to control boost instantly using simple buttons. There are no external box or device to hook up to and everything is set up through the gauge by using buttons on the left and right. Comes with a 29 psig integrated pressure sensor, built-in overboost protection, scramble boost, and output for warning light.