Aeromotive Fuel System 15632 0-15 psi Fuel Pressure Gauge

The manual pressure relief "valve" allows you to purge this gauge. I've tried 5 others, oil and non oil filled and this one has a steady needle and consistent readings! Note: when heat from the engine compartment warms up oil filled gauges, they do not read the same as when cold, if at all. During the most recent turbo charged engine & fuel system build, we found all other gauges to have inconsistent readings which caused a lot of problem solving failures. Aeromotive makes superior products (also used throughout my fuel system) & this gauge set the bar for future builds! I no longer have to waste time & money of inferior products w/miss readings.