How to Install an Electric Oil Pressure Gauge

An oil pressure gauge is one of the essential instruments in any car. It usually indicates the engine's overall performance well-being and as an early warning sign system. So, its important to avail the knowledge about how to hook up an electric oil pressure gauge in your car.

This oil pressure gauge notified in advance if any problem comes along so you can investigate the cause before any expensive breakdown occurs.

The gauge mainly monitors the oil pressure in one of the main oilways near the pump and filter. For this, the gauge has a tapping in the engine block, and there is a screwed sensor for the electric oil pressure gauges or an oil-pipe take-off for the Mechanical oil pressure gauges.

The sensor of the oil change light is screwed into the main union, at this point whether or not the car is fitted with an oil pressure gauge.

The Mechanical gauges work by forcing the needle around the dial under pressures from the main engine.

On the other hand, the Electronic oil pressure gauges work by using the sensor screwed into the engine, blocked for producing a variable resistance. This resistance affects the amount of the current passing through the circuit containing the gauge and the sensor.

Electronic oil pressure gauges are accessible for any DIY-mechanic to install, whether you are replacing a faulty oil pressure gauge, any custom gauge. The oil pressure gauges are designed to inform the driver if the oil falls below a safe operating level or if the oil pressure is too high.

11 Steps to Install an Oil Pressure Gauge:

Driving any vehicle without an oil pressure gauge can indeed lead to catastrophic engine failure. Most oil pressure gauges come with mounting panels and also some necessary installation hardware.

All those essential hardware can easily be purchased from any auto parts dealer if they are not included with the oil pressure gauge.

Step 1: Determine the Location

First of all, chose the location where you have to set the oil pressure gauge. The location may be in the dashboard or on the right or left side of the dashboard.

Most people install outside the dashboard, but it's recommended inside the dashboard location because it is easy for the driver to look at the gauge during the drive.

Step 2: Separation of Gauge Panel

The next step is to remove the gauge panel with the help of a screwdriver so that the installation of the gauge could be easy, and the wiring attachment may not seem to be complicated.

Make a hole of 1/8 of diameter more significant than the gauge diameter so that it may set quickly in the hole.

Step 3: Drain the Oil

As we are directly working with the oil tanker of the vehicle, so it is essential first to remove the oil drain plug and remove the oil in a pan here. You can also change the car oil; it's a good chance after clearing the oil, close the drainer.

Step 4: Removal of the Old Gauge

The next step is to remove the old oil pressure gauge, which is faulty; remove it with the help of a screwdriver and keep its nails safe aside for use in the new meter.

Because it fits in them, and you should not have to buy new nails for the new gauge try to work with the old one.

Step 5: Attachment of the Sensor

Now remove the oil airway, the main pipe in the bonnet for oil pressure measurement. It is cylindrical and can be recognized because it is attached to the back of the dashboard; a pressure gauge wire connected to its sensor removes it with a wrench.

You can replace it with a new one or clean it and set it as it fits earlier. The purpose of removing the oil pipe was to check the sensor is working correctly or not. Because the principal fluctuation starts from the sensor; you can change it if needed.

Step 6: Attachment of Signal Wire

A signal wire is attached to the sending unit; that sending unit contains the other cables.

And then drop the other wires behind the dashboard from the pre-drilled hole in the dashboard. It will help to connect easily at the back of the dashboard.

Step 7: Wire Connections

Now connect the wire at the back of the dashboard from the signal wires; the topic of wire relating is explained below in this article. This is the main step do it carefully.

Step 8: Connection of Power Supply

Connect the power supply with the ignition engine with the 12 volts of power supply and interconnect the signal wire of the oil pressure gauge power supplier and ignition engine. When the vehicle is started, it quickly detects the oil airway.

Step 9: Ground Wire

Now make round the wire around the vehicle's chassis or, with the help of a drill, make a hole in the vehicle's body and run the ground wire around this vehicle.

Step 10: Mount of Gauge Wire

In the gauge panel-mount the gauge wire, it's all done installing an electric oil pressure gauge.

Step 11: Oil Filing

The last step is filling the oil and tightening up the oil drain opener.

Start the vehicle to check the pressure gauge is working correctly or not.

How does the Oil Pressure Gauge Work

As we know now that the gauge helps to measure the pressure of oil in the pump and filter, it works on the electronic principle of magnetism in electronic gauge and mechanical code in the mechanical gauge through the pipeline.

Electronic Gauge:

In electronic oil pressure gauges, a sensor is attached to the pump or filter of oil, and it senses the resistance of oil in the airway of oil.

When the viscosity of oil increases, the light sensor attached to a particular point on the airway starts to detect the oil level. This electric change helps the sensor produce an appropriate magnetic field. The pointer moves to a specific position.

Also, see our related article on 7 steps to install a mechanical oil pressure gauge.


1. What is the best oil pressure gauge?

We can use both electronic and mechanical pressure gauges. Still, I think the electronic is best because it automatically detects the pressure and runs for an extended period than mechanical and gives a most precise reading.

A 100 psi gauge is more accurate with level, And it has 2% of spam and is more accurate.

2. How do you wire an electric oil pressure gauge? 

The wiring of electric oil pressure is too easy here I am giving the method and sequence of wires

  • Connect the red wire with the power supply
  • Connect the yellow wire with the ignition engine
  • Interconnect the white and green wire
  • Now connect the black wire with the sensor
  • And at the end, attach the negative battery cable.

3. Why does my oil pressure go down when I accelerated?

When we are driving our vehicle at high speed, our engine starts burning, and on increasing acceleration, the viscosity of oil starts rising.

It becomes denser due to burning and drops a little bit; that is why the gauge measures the low value of oil in pumps and filters of vehicles.

Final Verdict

When it comes to electric oil pressure gauges, they are easier to integrate into the modern one-piece printed circuit instrument panels used in most common modern cars. They are usually less bulky and much easier to route connect a wire to them than a pipe.

Mechanical gauges are not usually as standard as electric gauges, although these are still available in accessory shops.

As the oil arriving at the back of the gauge is at the engine pressure, one can indeed have the problems of messy leaks if the pipes suddenly comes undone. However, some people still find a mechanical gauge much more trustworthy.

Many cars do not have an oil pressure gauge fit. Still, because some indications of low oil pressure are essential, especially zero reading, those cars will at least have an orange or red warning light that keeps on shinning if the oil pressure drops below a certain level.

Often these warning lights can be connected to an oil-level sensor, and even in some cars, the light doubles as an engine temperature warning light.

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