Oil pressure gauge drops to zero when idle

What is your question?

I have replaced the oil pump, oil pump shaft, oil pressure switch, plugs, wires, distributor cap and rotor. Also changed the oil and filter. It only seems to act up after running a while and idle below 1k.

What makes this problem better or worse?

Worse after engine has warmed up and drove a while

How long has your 2000 Dodge Ram 1500 had this problem?

Couple of weeks