FARIA KRONOS 2" OIL PRESSURE GAUGE 80PSI GP7684 - Kronos 2" Oil Pressure Gauge - 80 PSI - 2" - Hole size: 2.0625" (53mm) - A pressure gauge operates by sending a low amperage current through the gaugess 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 senders resistance varies, the amount of current allowed to flow through it to ground changes and the meter deflects, showing the change in pressure. - Benefits - Anti-scratch glass lens - Plastic Cases for corrosion resistance and long life - 12 VDC negative ground - Can be adapted for 24 VDC systems - Available in standard or Metric values -