Fuel Pressure Gauge0-100 psi (EFI)1/8" NPT Male FittingOil Filled1-1/2 in. Diameter FiTech�s Fuel Pressure Gauges are the perfect compliment to your modern fuel injection system! This oil filled gauge features a crystal clear 0-100 psi (EFI) reading on a 1-1/2 inch diameter gauge body. It has a 1/8-NPT male fitting on the back ready to thread into an 1/8-NPT female port./