I have a 99 v6 4x4 Blazer
When idling, my gauge shows 20psi oil pressure. Is that normal or should it be around 40psi?

 

the camaro my buddy has got shows 20 psi when its anywhere from a quart to a lmost two quarts low. (has an oil leak lazy hasnt fixed it yet)

 

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There is nothing wrong with 20psi at idle. GM states the minimum oil pressure at hot idle to be 8psi and it should increase by 10psi per 1000RPM above idle up to between 40 & 60psi.

 

i wouldnt worry...mine is 20 at idle cold then drops to 10 +/- when warmed up.
i am going to do a mechanical gauge set in the near future...just because..figured it cant hurt and it will give me that ricer look i have always wanted.