Faria Chesapeake Black Series Oil Pressure Gauge (80 PSI)
A
pressure gauge operates by sending a low amperage current through the
gauge's meter to the ground via a sending unit with variable resistance.
The resistance of the sending units increases or decreases with the
changes in pressure, temperature, etc.
As the sender's
resistance varies, the amount of current allowed to flow through it to
the ground changes and the meter deflects, showing the change in
pressure.
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Faria Chesapeake Black Series Oil Pressure Gauge 80 PSI - 14702