My oil psi gauge is kind of working, when i turn the car on it maxes out, then when it warms up the needle is a little less then half when idling and when i push the gas it goes a little over half and when i hit 100km it almost maxes out then after a little it will go back to the mark after half way then it will go back to max and it will twitching back and forth.............dose anyone have any ideas??