Oil pressure location
 

I'm interested in adding a oil pressure warning light. My question is where I should pull the reading from.

1. Use an inline an adapter and pull right from the oil cooler line.
Or
2. Use the stock oil pressure location on the front.

I've looked at the galley plug on the top of the engine and am not comfortable bending the maf wires to gain the required clearance.

I'm not sure about the ramifications of removing the OEM sensor from the system.

Any thoughts?

Well the OEM sensor is just that, a warning light. I've heard you can remove it and no codes from the ECU.

But if you're going to remove it, might as well go with a full gauge that shows pressure all the time.

This. If it's the same as my '13 STI - you can remove the OEM dummy warning light sender and put in a real oil pressure sender. I had it working wonderfully with a Defi gauge and no warning lights/codes (on the STI).

This is 100% correct and the correct way to monitor pressure.

The idiot light basically means 'it's too late, dawg'.

Unplug the sensor, remove sensor, purchase galley plug adapter, add a proper gauge, done! :thumbsup:

OEM Galley Plug adapter: https://www.rallysportdirect.com/par...il-galley-plug

Oil pressure gauges: https://www.rallysportdirect.com/scp...D=Oil+Pressure

Support a local vendor, but that's a good way to look at what's out there.

Avoid prosport, consider AEM, Defi, and STRi.

JM.02

Look for an Innovative dual temp/pressure gauge.

There's an oil gallery plug just under and to the left of the air condition pump. This is the best spot to take an oil press reading.

I guess I'd rather have a light than a gauge I'll end up ignoring. I don't want to have to check it, I just want to be alerted if I lose pressure.

If I end going with a gauge this one is very high on my list.

By then it may be too late...

Maybe I don’t have a strong enough understanding of the oiling system but why would a drop in pressure show up on a gauge but not a warning light. That’s a bit of a rhetorical question as I understand the principal difference between a light and a gauge. I’m just not convinced that a gauge is going to alert me any faster. If I’m wrong, I’m wrong…..

For example; if an oil cooler line ruptured, would the system sustain enough pressure to not trip the light? How much (if any) is dependent on where the sensor is located, such as the oil cooler return line vs oil galley. Hence my original question.

I think the issue is that the light illuminates when you have, essentially, no pressure. I dunno what the exact level is, but the threshold to where it turns on is really low. That's like your TPMS sensor letting you know that you have 0 PSI in your tire, at which point you're already fucked. A gauge allows you to identify a DROP in pressure, but not one so severe that it causes engine problems. To use the TPMS analogy, that's like letting you know that your tire pressure has dropped to 25 PSI, which isn't catastrophic, but gives you a heads up that you might want to look into it before your tire essplodes.

Most aftermarket oil pressure sending units are 25 psi. With our cars idling as low as 5 psi a light will be on quite a bit of the time.

Right, that's a fair drawback, ignoring(or second guessing) the light at low rpm.

Pressure gauge or none, I've for years considered replacing the idiot light with a loud buzzer.

That would be a way to go. In my Minibusa track car I used a round LED tail light for a low oil pressure warning light. About 2" diameter. No way were you going to miss that baby.