HOTSYSTEM New 52mm Universal Single Dash Gauge Pod Mount Holder Material: Plastic Diameter of bottom holder : 2.17"/55mm Height: 3.74"/95mm Hole Depth:3.35"/85mm Suitable for 2"/52mm exhaust gas temp gauge, turbo boost gauge, voltage gauge, tachometer gauge Air/Fuel Ratio gauge and so on. Easy installation:Our gauge pod includes necessary mounting hardware. Mounted on any surface,gauge can be hold firmly.