Liquid filled gauge for the GFB FPR range. A must for your fuel pressure regulator! 40mm (1 1/2 inch) Fuel Pressure Gauge, silicone fluid filled for stable readings and long life. Features a clear and easy-to-read dual scale pressure range from 0 to 120 psi/8 bar. With a 1/8″ NPT male thread connection this gauge is directly compatible with all GFB fuel pressure regulators. Part no 5730