Oil Pressure Tester Tool, Oil Pressure Gauge kit, 0-140 PSI Pressure Test Diagnostic Tools, Engine Oil Pressure Tester Tool kit, for car Truck (red)

I ordered this tool specifically to get the adapter set which should cover all applications. The adapter for a specific BMW comes with an installed o-ring seal and was easily installed with the quick disconnect on the hose allowing a capture of oil pressure readings over a range of operating conditions. This is far more convenient than trying to thread a hose fitting into a limited access port on the engine and it includes a 90* adapter to avoid kinking the line in limited spaces. Starting the engine from cold, I started collecting data every 3 minutes as the engine temperature rose and a couple of throttle changes returned some questionable readings. Although the pressure would increase as RPM increased, it would not return after idle speed was reestablished. At this point, I was almost ready to return the product and give in a negative rating, but decided to investigate. I wondered why the manufacturer would add a relief valve to the product and found that pressing the valve would return the gauge to zero and allow capture of the correct reading while making a messy oil spill. Taking it apart, I found a Shrader valve is installed in the brass disconnect fitting. This would be a necessary feature on a compression gauge, but not on a pressure gauge intended for engine or transmission pressure readings. After removal of this small part, the gauge set worked perfectly and earned the 5 stars. My conclusion is that the vendor probably also sells a compression gauge set and uses the same hose assembly for both gauge sets. With the modification this is a must have tool if low oil pressure is suspected or to just verify correct reading on a dash instrument.

My only complaint is the case isn’t tight on the fittings. Other than that it works and is a good price point.

it has an air bleeder/pressure relief button press on the side, as many are most likely asking about the design and how this works read on, once the air is bled, it will read the highest pressure and hold it, each time you press and hold the relief valve a few seconds it will squirt oil and give you the current reading, it will not give you current pressure values or drop the needle by itself. I expected as much and it worked for my situation. Other then that, great product.

see if idiot light was working properly, it wasn't

The thread pitch is not in description and I needed a m10x1.0mm but the kit has only a m10x1.5mm. I also tested the accuracy from 15psi to 60psi using a known accurate air pressure gauge and this kit consistently reads 4psi lower than actual. For example if this gauge reads 16psi the actual pressure is 20psi.