low oil pressure

#1
my engine light flash frequently and my oil pump is fine,oil fliter is good,oil switch is fine and it also supply oil when i open the top cylinder and i have replace the crankshaft and is still flashing the engine oil light and i dont know what to do again please
 
#2
Maybe it's the oil pressure sensor. I actually installed an oil pressure gauge on my 10th gen Corolla to give me more information. I hate just having a light.
 
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