Tough situation. But unless I'm mistaken, you did the diagnosis and the shop did the work that you requested, so I'm not quite sure how it's just the shop's problem. Now, if they were paid to assess and diagnose, that's a different story.
It seems like this situation would call for some additional diag to help determine the root cause of the suspected lack of oil pressure. Using a manual gauge would tell, for sure. Also, the engine may have adequate oil pressure, but a faulty gauge could mis-represent that. Think about doing the stepper motors especially if the cluster has never been rebuilt. An alternative is to stick a like cluster in it to see if the gauge on the substitute cluster acts differently.
It seems like this situation would call for some additional diag to help determine the root cause of the suspected lack of oil pressure. Using a manual gauge would tell, for sure. Also, the engine may have adequate oil pressure, but a faulty gauge could mis-represent that. Think about doing the stepper motors especially if the cluster has never been rebuilt. An alternative is to stick a like cluster in it to see if the gauge on the substitute cluster acts differently.
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