From high banked ovals to Saturday night 1/4 miles, knowing that you?ve got proper cooling system pressure is critical in any severe service application. AutoMeter?s Mechanical Water Pressure Gauge utilizes the most precise bourdon tube meter movement on the market to deliver accuracy and durability you won?t find anywhere else. An 1/8? NPT connection on the back makes for easy installation and nylon line and fittings are included.