2022 oil temperature while towing

[NIsaacs]

Yes, three pins on my Isspro sending unit. And come to think of it my tractors use a light for oil pressure. The Fords do have gauges but maybe they are calculated too.

 

[slowmover]

• My new-old auxiliary gauge panel has come right along.
  
  
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[slowmover]

Of course, my next-door neighbor (who ran triples after I ran a compound setup) has his new aux panel:

 

[petersonj]

I have your first setup on my zero turn lawnmower.

- John

 

[brucejohnson]

Of course, my next-door neighbor (who ran triples after I ran a compound setup) has his new aux panel:

View attachment 140091

You should see the other side of those panels...

 

[User113]

My '21 has two wires but sag says one is cut off?

My old Fords and old tractors only use a one wire sensor for oil pressure and coolant. Can one wire work in some instances?

Yes! An analog value can be communicated to a gauge using a single wire; the sender unit's case is often the ground connection, grounded by screwing the sender into a manifold, engine block, etc. This can be seen in the image below:

But on more modern vehicles, most analog sensors seem to use 2 wires. One being the analog signal being monitored having a voltage applied and the other wire being a dedicated ground wire. As seen below:

In the circuit above splice S157 ties the sensor grounds from the APPS, ECM, Engine Coolant Temperature Sensor and the Water In Fuel Sensor together. The reason these modern vehicles use two-wire sensors is that the dedicated ground wires provide a more reliable connection, thus a more accurate signal that will usually have less noise. They don't have to worry about corrosion, dirt or sealing tape at the mechanical connection. But, as you can see, the electrical circuits in two-wire sensors and one-wire sensors are identical. The only difference is how the sensor is grounded.

 

[AH64ID]

All this talk about oil temp, and then other rigs has reminded me of an oil temp gauge with the helicopters I fly.

All 4 versions of advanced helicopters I’ve flown for the army have used the same basic engine, the T700.

The first aircraft I flew with that engine, AH-64A, had a selectable digital display in the front seat for engine gauge. It was a 5 position switch but only 4 positions functioned. The 5th position was supposed to be for engine oil temp, since the engine comes with a sensor and the wiring to the control unit, but Hughes decided it wasn’t necessary and Boeing agreed as it still wasn’t displayed when we got our AH-64D’s.

On the flip side every version of UH-60 I’ve flown, A/L/M, has an oil temp gauge. After casually watching oil temp for the last 8 years I can see why it was decided that it wasn’t needed in the AH-64, it’s just never been an issue. I’ve seen most other temp sensors on the helo’s be useful at some point, just not engine oil temp.

It’s also what I found watching oil temp with an aftermarket gauge on my 05. Fun for a while, but it wasn’t needed.