408 oil pressure issues

What kinda oil Ya runnin'? It is kind of common for lower viscosity oils to thin out when up to operating temperature especially in hot climates.... Do you have a mechanical gauge on there and
what are you reading on it?
Have a mechanical guage, had the issues with 10w40 and have had the issues with 10w30. Reassembled it with nylon bushings on both ends of the oil filter adapter fitting and will soon test drive it to see if I still am having the same issues once hot.