An oil pressure gauge that has a defect can give an indication of low or high oil pressure
1U5470 Engine Pressure Group
The 1U5470 Engine Pressure Group can be used to measure the pressure in the system. This tool group has a gauge to read pressure in the oil manifold. Special Instruction, SEHS8524 is with the tool group and gives instructions for its use.
Oil Gallery Plug
(1) Plug.
Oil pressure to the camshaft and main bearings should be checked on the side of the cylinder block at oil gallery plug (1). Install the adapter, seal, reducing bushing, and the 1U5470 Engine Pressure Group to this opening. With the engine at operating temperature (using SAE 10W30 oil), under full load condition, minimum oil pressure should be 250 kPa (36 psi). With the engine at operating temperature (using SAE 10W30 oil), at 750 to 850 rpm low idle, minimum oil pressure is 100 kPa (15 psi). With the engine at operating temperature (using SAE 10W30 oil), under full load condition, maximum oil pressure is 600 kPa (88 psi).
Engine Oil Pressure Graph