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Q: Oil pressure gauge variation on 1994 Dodge Ram 1500

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When I start the truck up the oil pressure gauge reads normal. When I accelorate the oil pressure gauge drops to almost nothing. If I let off teh gas the pressure returns some. Is this a sensor issue or an oil pump issue?
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(1) Comments
I've seen this before in high mileage trucks of varying makes. In most cases the oil pickup screen (attached to the oil pump)is/was clogged, allowing just enough oil through at low RPM's, and very little at higher RPM's.
The oil pan will have to be pulled to verify the problem either way.