Monster Mechanical Boost (35 PSI) - 2 5/8 inch Cutout $77.40 Monster Mechanical Fuel Pressure (15 or 100 PSI) - 2 5/8 inch Cutout $77.40 Monster Mechanical Oil Pressure - 100 PSI - 2 5/8 inch Cutout $77.40 Monster Mechanical Pressure - 60 PSI - 2 5/8 inch Cutout $77.40 Monster Mechanical Vacuum/Boost (30 In/20 PSI) - 2 5/8 inch Cutout $77.40 Monster Mechanical Water Pressure - 35 PSI - 2 5/8 inch Cutout $77.40