Proper oil psi for break in 5/20 oil

What is your question?

I just installed a remanufactered 1.8 fee engine in my spyder.The oil pressure starts out @ 55 psi then after warm up drops to 5 psi @ idle. when I rev it to 3000 rpm it raises to 38 psi.What is the wanted oil psi for the 5/20 break-in oil, and is there a idle check valve that might be causing the oil pressure to be low? Yhank You, Bobby Eye