CNG/LPG Emulator for different cars: 4 Cylinder cars and 6 cylinder cars. CNG/LPG Emulator for different cars: 4 Cylinder cars and 6 cylinder cars.When gas works as fuel, this device will cut off oil route of injector cars, and produce analog signals which will be sent it to original ECU, so that ECU could work normally on the condition of using gas. CNG 4 Cylinder Emulator