This QuickCar Gauge is a Fuel Pressure unit from the Extreme Gauge Series and features the QuickCar Logo. A 12 or 16 Volt power source is required to power gauge. Display has a 0-15 PSI Range and gauge is a 2-5/8" Diameter. This is Mechanical type gauge with a Male 1/8"NPT connection on the backside. Tubing kit not included and sold separately. A fuel pressure sender, 61-730 purchased seperately, is required to make gauge change colors when pressure drops below 4 psi. A fuel pressure isolator is highly recommended for use with this unit. Sold each.