... waterproof craft, avoiding water inflow when you are washing you car, so that the gauge can be used longer.Specification:1 ... range: 0~400bar, 0~6,000psi (dual scale)5. Coupling: Bottom or back connection6. Thread Coupling: M20x1,5, BSP, NPT, BS ... system5VTESAG direct injection12V 50mm direct injection CNG pressure gauge for car