oil pressure on sonoma

I have a 2001 GMC sonoma, 5 speed.. Is it normal for the oil pressure to go up and down with the RPM, or should it stay around 50 psi ?
//\\ we must not allow ourselves to think that this should be come a war of "our kind" vs "their kind"..For "our kind" is capable of great horror also... RIL
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.