Turbosmart TS-0101-2023 52 mm - 2-1/16" 0-30 PSI Boost Gauge for Gated Boost Control Valves Turbosmart 52 millimeter 30 pascals per square inch pneumatic boost gauge High-grade brass and billet aluminum Minimizes wastegate creep Improve turbo response by up to 800 revolutions per minute Increases performance