... to 400bar/psi,or 0-40Mpa/psi 5.Installation:Bottom connection, Back connection .6.Thread:BSP,NPT,BS,UNand other special specification7 ... .Temperature:-10~70°C 8.Relative humidity:≤80%9.Wire connection:white wire ,output signal red wire , positive Voltage black wire ... the green light on switch lighted. stainless steel 50 mm cng pressure gauge manufacturer