Below is a list of Water Pressure Gauge manufacturers from San Luis Obispo, California. Water pressure gauges are tools used to indicate the concentration of water in an enclosure. Such enclosures can be storage tanks, machinery like pressure washers, pump systems and any other kind of equipment used to store or transport water. Monitoring of water pressure is important in all kinds of devices and machines, particularly those that involve hydraulics. The flow and temperature of hydraulic fluid, which can sometimes be water, must be carefully monitored in order to ensure peak performance and safe operation.