2-1/16in. WATER PRESSURE; 0-35 PSI; ULTRA-LITEFrom 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. Incandescent Lighting Illuminates Around Perimeter Of Dial Mechanical Gauges Do Not Require 12V Power To Operate No Electrical System Required For Gauge Operation Incl. 1/8 in. Nylon Line Compression Fittings Incl. T-Fitting Vacuum Fitting Incl. Bulb/Socket Assembly/Red And Green Bulb Covers Incl. Mounting Hardware/Instructions