Hey scotty. I have an 1988 chevy scottsdale k1500 350 tbi motor. My oil pressure use to be 30 at idle and 50 and 55 while driving. Now it's 25 at idle and 30 while driving. But no matter what it won't go over 30. Should I worry

first, put on a real oil pressure gauge or have a mechanic do it to see what the real pressure is. The gauge on that old thing is often unreliable