Ranger High Oil Pressure

For whatever reason my oil pressure guage on my engine is reading that I have abnormally high oil pressure on a 94 ranger with a four liter. It stayes between the H and the L on the end of "normal". As it rises the engine tempture slowly rises once the pressure stops rising. It seems to me a port somewhere must be blocked becaue when I turn the engine off and on it slowly rises back to that place on the pressure guage. If this is a correct diagnosis how do you go about unpluggin the engine?