you have two options for oil feed...

Unscrew the Oil Pressure Sender. Its located on the back of the block to the left of the oil filter. The hole is a 1/8" BPST Threaded fitting. You have two options, you can screw a T fitting into the block and screw on your oil feed and Oil pressure sender, or you can screw in a fitting then run a stainless steel line to a T fitting mounted on your firewall. The best of the two options is the T fitting that you would mount on your firewall simply becase the threaded hole on the block is very weak and is notorious for breaking off.

Option 2:
Get a Greddy or Golden Eagle Oil Sandwich. This is simply something that sits between your oil filter and block and has 2 threaded holes. perfect for a turbo and oil pressure guage.

IM me on AOL for a diagram of the firewall mounted T, my screen name is Jeterkm02