Oil Pressure Gauge Installation
To install an oil pressure gauge you will first need to purchase one. These can be purchased from most speed shops or PartsForYourCar.com. The type of gauge is irrelevant.
The port for either mechanical or electrical installation is located about 4 inches to the right of the oil filter on the front of the engine. To find it, you may need to safely jack up the front end of your car and remove the lower plastic shroud to expose the oil filter and pressure sensor.. You will see the filter. Just to the right of it is the factory oil pressure switch. It is silver in color with two wires running into the electrical connector.

(click to enlarge)

This switch only goes to an idiot light on the dash. There is no signal to the PCM. The reason for noting this is that the switch will be permanently removed. If you are scared about not having this light on the dash, think of it this way. You will now be able to see the actual pressure. That switch closes at or below 5 psi of oil pressure. This is lower than you want to be. So the new gauge will be a better solution.  Also, GM decided to use a normally closed switch that opens when the pressure comes up. I was curious as to why GM would do this. If the connector came off or a wire was cut, the light would never come on with the current configuration.
It is recommended that you disconnect your battery when installing the sending unit.  The unit is right by the engine starter and it is possible that you could touch the starter with your tools and get a nice spark.


You do not have to drain the oil to remove the sending unit, but make sure the engine has been sitting a while so the oil drains back into the oil pan (a set or ramps comes in handy here).   Remove the electrical connector off of the pressure sending unit. Next remove the sending unit. It is threaded into the housing and comes out fairly easy.

The rest of it is up to you depending on what type of gauge is being used, either mechanical or electrical. I would suggest an electrical since only a single wire needs to be run from the sending unit to the gauge. Whereas the mechanical one would require tubing to be run into the car with the chance of a leak. Warm oil on the carpet inside the cabin is not a good thing.

Either way, the port you will adapt to is a 1/4" pipe or NPT female fitting. If you are using an electrical sending unit, most come with 1/8" pipe threads. All the necessary adapters are included with the Autometer kit.

Install your fitting or sending unit (USE TEFLON TAPE!!!), with adapter and run your signal wire or tubing to the gauge and supply a switched power source for the backlight. 


Click here for gauge lighting instructions


Pictured below is a copy of the wiring diagram for the Autometer Oil Pressure Gauge:

Questions? Email me & ask