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Oil pressure dropping faster than it used to


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1973 Datsun 240z, had engine rebuild less than 5k miles ago, oil changes with 10-30 vr1 oil. Normally has pretty high oil pressure that stays up at least 75%+ of the dial at 3-3.5k rpm,  now it does not go as high and it goes down much quicker than it normally does and gets closer to 0 then it ever has. Have not touched anything on the engine, except for pulling valve cover to prime fuel pump a couple times since i ran out of gas.... any input or direction would be appreciated! thank you

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Temporarily hook up a  mechanical gauge to double check the pressure. The electrical oil pressure sensors are well known to fail with age. And then they will read low.  Cloes to zero at idle is common with a faulty sensor. 

 

May be nothing at all wrong with the engine. 

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