Turbosmart 0-100psi FPR/OPR gauge turbosmart Sale! from 3999 /per Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Fuel Pressure Gauge.Suits Turbosmart Fuel Pressure Regulator Series including FPR800, 1200, 2000 and 3000. Fits 1/8 NPT port.