I have a mechanical oil gage with a copper capilary tube. Noticed the pressure drop to 5 psi at idle and only 20 psi at speed. Changed oil and filter. Same results. Installed test gage in oil filter housing. Same results. Engine is getting lubed and runs fine. I don't think any galley plugs are gone, because, I don't see any external oil leaks. Oil pressure normaly runs 55 psi at speed and 20-25 at idle. I'm thinking that the regulator ball in the oil pump got stuck or the regulator ball spring broke. Also could be clogged pickup screen.
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