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Low oil pressure at idling RPM

Engine

Model: 964, Year:1993, Mileage:84000, Type of use:Street use only
My 93 964 (Tiptronic) has approx. 84,000mls......still all original. I am running 15W40 oil.After the engine warms up, the oil pressure warning light will come on while idling or while stopped in traffic. As soon as I rev the engine and start driving again, the pressure goes back up and the warning light goes off. When the light does come on, the pressure gauge does indicate fairly low pressure...... otherwise engine is running well and strong.Replaced the oil pressure sending unit as a first step. The low pressure light now comes on more consistently while idling.... Any thoughts for next steps in diagnosing this issue?

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