There are two types of oil pressure guages. The one that has been around the longest, yet is still in use is a mechanical guage. The later developed guage is called an electrical guage, the system for which is comprised of an electro-mechanical sensing unit [commonly refered to as a "sending" unit], and electrical circuit, and an electrically operated guage. On a mechanical gage, oil pressure signal is sent via a small tube to the gage. inside the gage is a hollow curved spring call a Bourdon tube. As pressure increases, it tries to straighten the spring which has a linkage and arm which is connected to a needle which sweeps a calibrated face thus giving you your numbers. On an electric gage system, a voltage source is sent to the gage which passes through a coil which interfaces with a needle arrangement that moves according to the current flowing through the coil. That current is controlled by the sending unit which is screwed into an oil galley in the engine block. There are differant sensing arrangements but the most common is a variable resistor which allows a calibrated amount of current to go to ground, this is calibrated to the gage face and thus you get your numbers.
You need to remove the oil sending unit and install a oil pressure gage in it's place then start engine and read gage. Iwould tell you were the sending unit is but you did not say what you are working on. You need to remove the oil sending unit and install a oil pressure gage in it's place then start engine and read gage. Iwould tell you were the sending unit is but you did not say what you are working on. You need to remove the oil sending unit and install a oil pressure gage in it's place then start engine and read gage. Iwould tell you were the sending unit is but you did not say what you are working on.
Possible clogged oil galley, filter, defective oil pressure gage, or the use of an oil that is the incorrect weight. Replace the oil filter with a Purolator filter and change the oil. Install 5W-30 oil. If the pressure is still high then you need to have the oil pressure tested with an accurate test gage, to see exactly what it is.
I really have not heard the term oil pump switch. There is an oil pressure switch on some small engines that will shut the engine down if the oil pressure falls below a preset pressure. These are not installed on vehicles for safety reasons. You vehicle however has an oil pressure sending unit that keeps track of the oil pressure and will warn you of low oil pressure with a red light, or by way of a gage, or both.
The 6.9 oil pressure gage for some reason does not display a good indication of pressure like the 7.3 engines do. I think this problem is more related to the oil pressure sensor and the display gage rather than the actual physical oil pressure. To be certain, you can have a shop check the pressure with a mechanical gage. Higher pressure does not necessarily improve bearing life. All that is required is sufficient pressure to deliver the oil into every engine bearing. 10 or more PSI at idle should do that. Oil pressure will increase as engine speed increases. I have had several trucks with both the 7.3 and the 6.9. The 7.3 trucks always display in the middle to 2/3 range of the oil pressure gage, while the 6.9s tend to display on the lower end of the gage. Some 6.9s barely stay in the "normal" range, often right at the edge of the "N" for normal. I have NEVER had a 6.9 engine fail due to low oil pressure. However, I always check and maintain my oil level right at full, using a diesel formulated oil like Rotella 15W40. *Never* use thin oils like 5W20. That stuff is only for newer gasoline engines. If you are the type to worry about your oil pressure, add1 can of STP. Be very careful not to let any oil get on the alternator or fan belts. It helps to use a funnel and a cover rag on the belts.
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