1.cng change over switches 2,3position used for carburetor&Mixer system 3.2position used for sequential system cng change over switch is mainly used in controling change of gasonline and oil.When the rev of the engine reach the set-point,it will change to burn gasonline automaticly. Working pressure :DC10ν-15νworing electric current :<500mA(No external electromagnetic valve)Drive current:The ...