... get to know the gas volume inside cylinder. Specification:1. Type: YR 2. Accuracy rating: 2.53. Case Diameter: 50mm=2 ... : 0~400bar, 0~6,000psi (dual scale)5. Coupling: Bottom or back connection6. Thread Coupling: M20x1,5, BSP, NPT, BS, UN...7 ... Switch Relative Voltage4V 12V5V 12VCB02K3101/K20312VCB08JETTA system5VTESAG direct injection12V Lovato Type CNG Pressure Gauge