The Kenworth Primary and Secondary Reservoir PSI Gauge is a green gauge with a chrome bezel that accurately measures the pressure of your truck's primary and secondary reservoirs. This gauge is a practical and essential tool for any truck driver, ensuring that your vehicle is running at optimal performance levels. With its easy-to-read display and durable construction, this gauge is a reliable and long-lasting addition to your truck's dashboard. Keep your truck running smoothly with the Kenworth Primary and Secondary Reservoir PSI Gauge.