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I just installed a oil pressure guage and am perplexed by the readings I'm getting. The oil pressure at idle in the mornings (cold) is about 30 lbs. As the engine comes up to operating temperature the oil pressure goes up to about 40 lbs. At higher rpms the pressure stays around 30 lbs and when warm and idling it goes up to about 40-45. Can anyone explain this or should I look for UFO's overhead? I have tried two different sending units with the same results.