A CNG gauge is an essential device in CNG-powered vehicles, designed to measure the level of compressed natural gas in the fuel tank. It displays the remaining fuel, typically through a digital or analog readout, indicating when the vehicle needs to be refueled. The gauge works by monitoring the pressure inside the tank, as CNG is stored at high pressure, and this pressure decreases as fuel is consumed. The gauge helps drivers manage fuel consumption, avoid running out of gas unexpectedly, and maintain vehicle performance. In cities like Delhi, where CNG vehicles are common for their environmental benefits, a reliable CNG gauge is crucial for safety, efficiency, and optimal fuel usage.