What Is the Year, Make and Model?
Did your check engine light come on?
What is the Year, Make and Model?
SO the gauge is not registering at all?
Normally a bad sending unit could cause this issue however they will usually still read incorrectly. I would at this point have a mechanical oil gauge installed.If the mechanical oil pressure gauge confirms that you do have a low oil pressure problem the oil pan will have to be removed to inspect the oil pump and possibly the engine bearings. I would suspect a bad gauge, but having the system pressure tested would be a good idea.
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I do have some information.
These sensors are mounted on the engine and are controlled by the oil pressure. When the pressure is high, the switch is held in the off or open position allowing no current to flow to the oil pressure warning lamp on the instrument panel. When the oil pressure switch is in the low, on or open position, current is permitted to flow to the oil pressure switch warning lamp. This will cause the light to illuminate telling you that oil is needed immediately. You should always keep a quart of oil in your vehicle at all times in case of such an emergency.
See Figure 4
When a problem occurs with an oil pressure gauge, examine the sensor (sending unit) and its wiring.
Check the sending unit and wiring by grounding the connector leads at the sending unit.
With the ignition ON, a grounded gauge will cause the oil pressure light to come on, or if equipped, the oil pressure gauge to read at or above maximum.
Fig. 4: A common oil pressure sensor connector
If the gauge does read at or above maximum, it is still operating.
REMOVAL & INSTALLATION
Disconnect the negative battery cable.
Disconnect the terminal ends on the unit.
Spray lubricant on the unit, to ensure an easy removal.
With a suitable open-end wrench or a socket, unscrew the sending unit.
Make sure area is clean before replacing the sensor. Scrape any remaining gasket material that may be left behind. Use a wire brush or a gasket scraper.
Lube the threads with oil on the new sensor and place the O-ring or gasket on the end going into the engine. Carefully thread the sensor by hand, making sure the threads are even, and you are not forcing the sensor into the block. Using a tool, tighten sensor but not to tight as it could break easily.
Connect the wires on the sensor.
Connect the negative battery cable.
Start engine and look for any leaks in case the sensor is not tight enough.
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Sorry for the delay, wanted to get you the correct specs for testing.