AEM 30-0309 X-SERIES 52MM LED BOOST / FUEL PRESSURE GAUGE 0~15PSI BLACK & WHITE AEMs 30-0308 X-Series -30in/Hg~60PSI / -1~4BAR Digital Boost Display gauge combines incredible looks, increased readability and a multitude of new, easy-to-use features! It is a must for users who want highly accurate boost pressure readouts up to 60 PSI or 4 BAR in their high performance vehicle. Visual improvements include a bright center LED display that is 87% larger than our original digital gauges and provides better readability. A sweeping green LED needle lines the edge of the gauge face for quick reference. Optional silver bezel with white faceplate accessory kit included. Slim 0.825 overall gauge depth and 0.200 cup depth  mount them virtually anywhere! User selectable standard or metric display ( -30in/Hg~60PSI / -1~4BAR).