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Where is the oil pressure regulating valve located at on a 1999 Chevy Tahoe with 5.7 engine?

The oil pressure regulating valve on a 1999 Chevy Tahoe with a 5.7L engine is inside the oil pump. It's not a separate, externally accessible component like a pressure relief valve might be on some systems. You cannot adjust or replace it without removing and disassembling the oil pump itself.