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Ok heres the problem me and my dad just rebuilt a 7.3 in a 2001 f 350 we got everything runnin the got about 200 miles on the rebuilt the one day the oil guage starts freaking out wehave replaced the sensor, pulledthe cooler to make sure the plug wasnt stuck. the guage sas the pressure is fine when the engine is revved up but when it idles it says it has no pressure. does anyone knowwhat else to look for. The engine is a rebuilt 7.3 turbo with oversized pistons everything else is stock.
When you did the rebuild did you clean the oil pressure regulator piston and bore?
If not that could be the problem. Get a pressure gauge on it and see what it is
really doing. If it is indeed dropping low at idle I would be thinking the reg.
Or a leaking gallery plug. Someone that knows more about the 7.3 is going to
have to chime in. You may want to post over in the 7.3 forum to get a better answer.