BBK 1617 Fuel Pressure Gauge - Liquid Filled With Fuel Rail Adapter for Fuel Injected Ford Mustang 5.0L - 0-60PSI BBK is your Number One Aftermarket Performance Brand in the USA - American Designed and Built 0-60 Psi Reading for Fuel Injected Applications Includes 1/16 In. Npt to 1/8 Npt Female Fitting to Install Directly Into Fuel Rail Liquid Filled to Handle Vibration Issues Fits into all BBK Adjustable Fuel Pressure Regulator Ports