... on the intake valve between cylinder and pressure regulator to show the pressure of natural gas in cylinder. ... 000psi (dual scale)5. Coupling: Bottom or back connection6. Thread Coupling: M20x1,5, BSP, NPT, BS, UN...7 ... ISO9001:2008, Certificate of Utility Model Patent10. Dial plate: Single or dual scale (psi, kpa, mpa, bar, kg/ ... lens, glass lens or acrylic lens can be connected to the sensor CNG gauge