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Old 06-13-2021, 09:59 AM   #15
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My uneducated WAG is it is in fact oil pressure gauge.

My oil pressure gauge is on the upper left.
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Old 06-13-2021, 10:06 AM   #16
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My educated "guess" is the same-- oil pressure gauge.


There is an oil pressure relief valve that controls oil pressure so it is NOT just RPM related.
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Old 06-13-2021, 10:08 AM   #17
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Most oil "pressure" gauges only show that you have a minimum pressure and not the actual pressure. The sender is like an on-off switch. If you have the minimum pressure the switch is on and your dash gauge is on but not really showing the true pressure, just that it's more than the minimum.
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Old 06-13-2021, 10:12 AM   #18
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Hmmm...

Oil pressure sender clearly works... as the bluefire shows fabulous oil pressure proportional to rpm...

I’ve never seen an oil pressure gauge that just goes to mid gauge and stays there?

Really really weird...

Is it ok to cross post this in the freightliner sub forum?
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Old 06-13-2021, 10:14 AM   #19
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Most oil "pressure" gauges only show that you have a minimum pressure and not the actual pressure. The sender is like an on-off switch. If you have the minimum pressure the switch is on and your dash gauge is on but not really showing the true pressure, just that it's more than the minimum.
Why does it show “low” and “high”? I know the low oil pressure light is an on/off thyme switch... never seen an oil pressure gauge work like that...
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Old 06-13-2021, 10:20 AM   #20
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How accurate is dash oil level gauge?

For sure that is an oil pressure gage.

My Cummins oil pressure “sender” is as stated just on/off. The ECM is programmed to read 55psi if pressure switch is on, my oil pressure gage that has actual numbers for pressure. Cummins opted to do this as too many customer complaints that their oil pressure was low at idle but it was actually just fine and normal.
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Old 06-13-2021, 10:27 AM   #21
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Simple test is to check the gauge with ignition on and engine off (IOEO).

If the gauge goes up with the engine off, it's a level gauge.

If the gauge stays at the bottom with IOEO, it's a pressure gauge. But a poor one IMHO.
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Old 06-13-2021, 10:36 AM   #22
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Yep, you guys got it...dug out the schematics...

It states “oil pressure gauge.”

Key on, motor off, gauge reads “0.” Turn it on,run it, goes to mid gauge...

I have never, ever, seen an oil pressure gauge function like this!!!
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Old 06-13-2021, 10:38 AM   #23
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Originally Posted by Spk64 View Post
For sure that is an oil pressure gage.

My Cummins oil pressure “sender” is as stated just on/off. The ECM is programmed to read 55psi if pressure switch is on, my oil pressure gage that has actual numbers for pressure. Cummins opted to do this as too many customer complaints that their oil pressure was low at idle but it was actually just fine and normal.
So it stays at 55 psi at idle??? Even though psi is probably 1/2 that?
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Old 06-13-2021, 10:42 AM   #24
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Quote:
Originally Posted by Mr_D View Post
Most oil "pressure" gauges only show that you have a minimum pressure and not the actual pressure. The sender is like an on-off switch. If you have the minimum pressure the switch is on and your dash gauge is on but not really showing the true pressure, just that it's more than the minimum.
Most of my cars with oil pressure gauges are from the 70’s and 80’s... the gauge is very much proportional to rpm... 1 bar/15 psi at idle, then goes up to 60-80 psi as shifting through the gears...

Haven’t had a newer vehicle with a pressure gauge, though... just low pressure idiot lights...
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Old 06-13-2021, 10:43 AM   #25
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Yes, 55psi once above low point on oil pressure switch. It either reads 0psi or 55psi. This is a well documented item.
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Old 06-13-2021, 12:30 PM   #26
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I swear, I don't think my oil pressure gauge is "On/Off" type, Best to my memory it varies depending on engine temperature and RPM. In fact, I really think that when the engine is really cold, that oil pressure is at the highest reading and tapers down as the engine warms up.

But then, at 72 my memory isn't want it used to be!
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Old 06-13-2021, 01:28 PM   #27
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How accurate is dash oil level gauge?

Yes, I had a 2005 Mercury that had that type of oil pressure gauge….and the temperature gauge acted like that too.

Oil pressure was shown to be zero when engine off, or exactly mid-scale on the gauge when engine running.

Temperature showed “C” when engine cold and then when engine warmed up the gauge shot directly to exactly mid-gauge
and stayed there…..presumably if the engine ever overheated
it would shoot directly to “H” but the engine never got that hot while I owned it.
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Old 06-13-2021, 01:51 PM   #28
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How accurate is dash oil level gauge?

Oil pressure gauge for sure and idle pressure can be lower on diesels. This ain’t a gas engine low normal or high oil pressure , company diesels ran 20 at idle and 30-50 max never more ! but I never checked guage accuracy.. I just drove em
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