What additional features should a pressure gauge installed outside the driver or passenger compartment have?

A pressure gauge installed outside the driver or passenger compartment should possess safety features that enhance its functionality and reliability in a potentially hazardous environment. The inclusion of a limiting orifice is crucial as it helps control the flow of gas and prevents excess pressure from leading to dangerous situations. A shatterproof dial lens is important for protecting the gauge from impact and ensuring that broken glass does not compromise safety in the event of an accident. Additionally, a body relief feature acts as a safety mechanism to prevent the buildup of excessive pressure within the gauge, thereby reducing the risk of rupture and associated hazards.

These features collectively contribute to the safe operation of vehicles using compressed natural gas by ensuring that the pressure readings are accurate, protected from environmental damage, and able to mitigate risks associated with pressure surges. Thus, having these safety features is essential for maintaining the integrity of the system and the safety of the passengers and driver.