2" Oil Pressure Gauge 5 Bar Metric - Chesapeake White - Stainless Steel BezelPerimeter-lighted white dial with bold black/blue graphics and flat glass lens.A pressure gauge operates by sending a low amperage current through the gauges's meter to ground via a sending unit with variable resistance. The resistance of the sending units increase or decrease with the changes in pressure, temperature, etc. Features:2" 5 Bar MetricChesapeake WhiteStainless Steel Bezel