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You could have a oil pressure sending unit going bad but the only real way to tell is to connect a real pressure gage in its place.
The minimum pressure @ idle with the engine fully warmed is 5 psi. At 3000 RPM, 30-80 psi. The switch minimum actuating pressure is 2-4 psi.

I assume you don't have a full gage set as I do in my 94 GC. Just my $0.02.

FredB
 
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