Our standard fuel pressure gauges measure from 0-15 PSI and are intended for use with carburetor plate and direct port nitrous systems. These gauges have 2 5/8 inch mounts and are available in several face plate colors. Product Features:For Use w/Carb. PlateFor Use w/Direct Port Nitrous SystemHave 2.625in. MountsSeveral Face Plate ColorsIn-Cockpit InstallationAccurate and Uniform ReadingsThrough Dampening Vibration