Hi guys,
I do not own Porsche but I am posting this for my g/f's Dad who has zero computer skills...
Here is the question:
he just installed a new relieve valve on her car and still has absolutely no oil pressure. Can you give him some pointers where to look...?
Thanks!

 

Has he had the front pulleys off for any reason? If the crank bolt is not torqued to 155ft/lbs, you won't have oil pressure.

When did it start, what work had he done recently, etc will help to figure out what is going on.