How do you check to see if the oil pump is working right

What is your question?

The truck had a low oil pressure light on in January. The shop said the truck was fine and couldn’t find that the pressure was low. The “timing Chain” broke a couple weeks later and destroyed the engine. We got the truck back Monday from getting a rebuilt engine. The low oil pressure light came back on Wednesday. Very frustrating. The shop said their diagnostics do not show low oil pressure. Ideas of things to check for? How do you test the oil pump to see if it is good?

What makes this problem better or worse?

Not sure

How long has your 2013 Ford E-150 had this problem?

6 months