0-15 PSI Liquid Filled Fuel Pressure Gauge 

1-1/2" 0-15 PSI Moon Eye Mini Liquid Filled Fuel Pressure Gauge

These 1-1/2" liquid filled fuel pressure gauges are perfect for monitoring fuel either at the carburetor, pump, or even fuel rail on fuel injected applications. They use a specific liquid filling to help control needle bounce in high-vibration applications. Fuel pressure gauge fittings allow easy adaptation to any fuel system.
It has a 1/8" NPT Fitting.