This QuickCar Gauge is a Oil 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 0-100 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 oil pressure sender, 61-735 purchased seperately, mus be installed to make gauge change colors when oil pressure drops below 20psi. Sold each.