1994 blazer with a 5.7liter fuel injected. since ive owned the vehicle alittle over three years...it has a hair over 100,000 miles on her. since i have had it ive noticed the oil pressure gage would drop to about 1/4 when coming to a stop. when i accelerate it goes back up to 1/2 or just over. my question is this......should it drop like that? there are no signs of oil leaks.....oil level is good. truck runs like a top. a guy i know who knows alot about cars noticed this the other day and questioned it. what do you guys think? should i be concerned? what would cause this. i should also note that there is the rair time that it stays about 1/2 when at a stop. any ideas.....im no mechanic.