... for CNG 2.ISO9001:2008 3.Certificate of Utility Model Patent 4.400bar/6000psi CNG pressure gaugeFeatures:CNG Pressure Gauge is ... Diameter: 50mm=2''. Or, your customized size4. Measurement range: 0~400bar, 0~6,000psi (dual scale)5. Coupling: Bottom or back ... black wire, negative Voltage10. Certification: ISO9001:2008, Certificate of Utility Model Patent11. Dial plate: Single or dual scale (psi, kpa, ...