Just got back in from the garage. I’ve been just piddling around a little here and there on the car, and have done two things to try to abate the oil leaks. First, I shortened the turbo oil drain hose by about 4 inches to take the low spot out of the hose. Second, I replaced the spring-type clamps with screw-type to make sure I had a good seal on the drain hose. After taking the car for a quick spin, I found that neither of those have actually worked.
I’m thinking that the oil is coming from either the pressure sender tee assembly, or from the drain line flange off the turbo. To test the pressure sender tee assembly, I’ll remove the whole thing from the car, disconnecting only the electrical connection from the sender, the thread into the block and the thread into the turbo. I’ll get a cap for the thread into the block (3/8 NPT, for future reference), and then apply pressure on the turbo side. If I get leaks, then there’s my problem. If I get no leaks, I’ll see about building a new flange for the drain line, only this time I’ll weld on an AN -10 fitting, put an AN -10 fitting on the oil pan, and use some braided hose between the two.