oil pressure? slow

After it's running, does the gauge respond well with fluctuations in rpm, up & down? I once got a little piece of trash in the line and it was slow at first and then wouldn't even drop with the engine off. Doesn't take much with that little 1/8th inch tubing. I replaced the line and all was good. If by chance it's a plastic/nylon tube, it may have a kink in it.