Amazon.com: MaxTow Double Vision 60 PSI Turbo Boost Gauge Kit - Includes Electronic Pressure Sensor - Black Gauge Face - Green LED Illuminated Dial - Analog & Digital Readouts - for Diesel Trucks - 2-1/16" 52mm : Automotive
How to Install a Boost Gauge and Wires in an MKIV VW or Audi - AxleAddict