Q&A

I would screw in a mechanical oil pressure gauge and verify engine oil pressure. They have about 3 to 7 psi at idle and about 40 to 60 at engine RPM above 2500 RPM. If you don't have oil pressure you have an internal engine problem that need to be addressed. If the oil pressure is correct the electrical short and subsequent electrical fire you had may have shorted out the wires that eventually go to or from the instrument cluster.
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I would check your oil pressure first if thats fine.The check your oil pressure sensor if thats fine.then most likely you have oil in your wire harness connector the goes to the oil pressure sensor or the wire harness connector has a short. My 2000 chrysler M300 oil light would flash every time i came to a stop light,come to fine out i need a new connector and the problem was fix.good luck hope you get it fixed

my 93 3dr ls did the same thing with the oil pressure light. your oil pickup is cloged