Analog pressure gauges are instruments used to measure the pressure of gases or liquids. They typically consist of a dial with a needle that indicates the pressure level on a graduated scale. These gauges operate using a mechanical system, often involving a Bourdon tube, which deforms under pressure and moves the needle accordingly. These gauges are commonly used in various applications, including industrial machinery, HVAC systems, and automotive engines. They provide a simple and direct way to monitor pressure without the need for digital displays or electronic components, making them reliable in many environments.