oil pressure gauge issue on 2006 Chevrolet Tahoe

my oil presure gauge goes to 80 and stays there. Is this caused by the oil pressure sensor and if so where is it located on the engine so that I can replace it?

Asked by for the 2006 Chevrolet Tahoe
You have a bad oil pressure sending unit.
Ok thanks, one guy told me it's the oil pump?
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I have a 2006 Tahoe & the oil pressure gage was going up & down now it stays on 80, is it the oil pressure switch ?