Faria Dress White 2" Oil Pressure Gauge (80 PSI) [13102]Dress White 2" Oil Pressure Gauge (80 PSI) Perimeter lighted White dial with bold Black graphics, White aluminum bezel, contoured Black pointer and flat glass lens. A pressure gauge operates by sending a low amperage current through the gauge'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 As the sender's resistance varies, the amount