4 pin Oil Pressure Sensor and Temperature Sensor
 

As a technician for GM I have to do warranty engine work and while doing a job now (rebuilding a seized 6.2L) I have to replace the oil cooler lines due to metal contamination. This is on a 2022 Sierra. I found that there is a oil pressure/temperature sensor combined into one that's mounted to the oil cooler lines right where it meets the block.

Basic pin out is as follows. One for 5V reference, one for OP signal, One for ground, one for OT signal.

Would it be possible to wire this into an MS3? Share one 5V reference and then send each signal to the extra connector for additional inputs? Or will it require two separate 5V references to work right?

The sensor will need a threaded adapter to work in place of the factory Miata oil pressure unit but it's about 1/3 the size of it and probably far more accurate. If this is something that can work you'd get two sensors for the price of one.

I can post pictures of the wiring diagram from GM if needed for reference.

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You're looking for something like this. If you have the two spare inputs, then you can wire it into your MS3.

https://lowdoller-motorsports.com/co...00-f-pn-899404

This type of sensor only need one 5v and sensor ground reference. Then wire each signal to a spare input in the MS3. The Lowdoller is a steal of a deal for one of these.

This. I'm using a Bosch OP/OT sensor and have it wired like this into my MS3: one 5v reference, on GND and the signal going into the 'squirt.

I have the Bosch one in my two Miatae too- you also need a pull-up for the temp input so:

- 5V out of the MS to the sensor
- sensor ground out of the MS to the sensor
- oil pressure input (is already 0-5V) from the sensor to the MS
- oil temp input (with a pull-up from the 5V wire from the sensor to the MS

The sensor I grabbed was free off a set of oil cooler lines I'm swapping out. With the plentiful availability of these sensors on many new LT/LS engines from 2019+ models it wouldn't be hard to find one in the scrap yard for a few dollars.

What is nice about the Lowdoller one is that it already thread matches into the factory location and does not require an adapter.

Wish I knew these existed before I installed my separate sensors, much cleaner and one less oil failure point, cat. Should be easy for most MS installs to wire into two analog inputs.

The part number for the sensor I'm going to try to use is AC Delco # 12685371. Retails for around 30 dollars. I'll grab the connector part number for reference as well. It'll be a bit before I install this so if someone decides to try this before I do please update this and let us know.

Do you know the calibration for the pressure and temp on the AC Delco part? That would be the only obstacle to make it work well.

I will try to get that information as soon as I can. It's been busy at work. I'll have to call GM Techline. Or do you think I can find it's min/max values then interpolate the in between? I'm not sure if it's a linear sensor though.

Bumps.

I'm still working on trying to find the information related to sensor scaling. I'm going to have to call AC Delco directly and speak to their technical department.