This vehicle uses a fuel gauge selector switch in order to allow the two fuel tank level readings (CNG and gasoline) to be displayed by one fuel gauge. With the ignition ON the fuel gauge will display the level for the fuel system currently in operation. When the fuel gauge selector switch is depressed the fuel gauge will display the level for the fuel system that is NOT in use. The fuel level for the non-operating system will be displayed for about 10 seconds. Passenger vehicles have a filtered fuel level display, depress the fuel gauge select switch 30 seconds after the vehicle speed sensor indicates the vehicle is at rest in order to avoid inaccurate gauge displays. When operating on gasoline a fuel indicator lamp (FIL) located within the fuel gauge selector switch will illuminate. The fuel indictor lamp will also illuminate for several seconds during start-up as a bulb check.