The Primary And Secondary Reservoir PSI Gauge is a practical and reliable product that monitors both primary and secondary reservoirs. With a gauge range from 0 to 150 PSI, it ensures accurate readings. The LED display is available in red, blue, or green, and the bezel comes in chrome or black. This gauge fits most Peterbilt models 2005 and older, as well as other models excluding Kenworth. Made in the USA, it features two high accuracy PSI sensors and cables. Easy to install in a standard 2 1/16 inch hole, this gauge is a must-have for monitoring reservoir pressure.