I'm going to say that feeding your turbo from the head is a bad idea. It's last in line for both oil flow and oil pressure. When you consider that the oil filter flange is first in line, it just seems like a bad idea to me. You can always drill and tap your oil filter flange. As to why you have no oil pressure I would guess it's because the turbo is taking all the pressure that the gauge would be seeing but I'm not sure.
Gasket is on correctly . Measuring oil pressure at the filter flange and I have a low oil pressure light at the head.I found two broken oil squirters with the pan down Would those have any effect on oil pressure?