Hi

If you have not got the kit and have a concern that is niggling you , my recommendation would be to find a good independent specialist who can put a test gauge on the system to verify the truth and determine what is happening in the engine as opposed to what the instruments are telling you.

The developed oil pressure while obviously originating from the pump is the product the pumps output minus the losses which comprise the sum of design and wear losses - so if you were down on pressure (for real) a simple (but expensive) pump replacement may not cure the problem.

Good Luck.

PS:

Design losses = pressure drop across filter, leakage from bearings

Wear losses = excessive leakage from worn bearings , defective lubricating rails (end caps missing), oil pump reflief valve not seating correctly.

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NormanB
230 TE (W124) 1989 with 153,000 miles on the clock - hoping for at least another 100K