... Certificate Of Utility Model Patent Waterproof Hydraulic Oil Pressure Gauge CNG Pressure Gauge is an essential part of CNG vehicles, fixed on ... in cylinder. Through a gas pressure sensor inside, the gauge sends pressure signal to fuel changeover switch, so that the ... Voltage10. Certification: ISO9001:2008, Certificate of Utility Model Patent11. Dial plate: Single or dual scale (psi, kpa, mpa, bar, kg/ ...