Wiring Harnesses | AEM Tru Boost Controller Gauge ; Boost Control Solenoid ; Weather Resistant Gauge Boot EMS-4 Wiring Harnesses. Patch/Extension Wiring Harnesses. 30 & 20 Amp Relay Wiring Kits Wiring Harnesses. Digital to Analog Gauge Wiring Conversion. AEM Side Menu Products. Products. CD Digital Dash Displays & Adapter Harnesses; Wideband UEGO Air/Fuel Tru-Boost Gauge Type Controller | AEM AEM’s TRU-BOOST Gauge-Type Controller is an electronic boost controller that combines the simplicity of a manual boost controller with the added ease of adjusting boost levels through a gauge interface. There is no external interface required for set up, and it is fully functional right out of the box.