Dvose, I just went through the same problem you have two weeks ago. I had my headers installed by a shop. They had to plug the hole where the 90 degree elbow for the sending unit and mechanical oil gauge goes into because the header pipe sits right against the hole for the elbow. Needless to say, they deleted my oil sending unit and mechanical gauge ports. So I did what Pete 67400 did. I extended the sending unit elbow out using a short copper pipe. They will fit under the header pipe. It works. These copper pipes/fittings are available in your local auto parts store. I bought mine in Carquest. I'm sure they are available in Auto Zone or Oreilley's. I will post a picture tonight when I come home (5 pm in california). My picture would show you the sending unit installed under header pipe. I even have a spare copper tube to show you with part number. I bought two with different lengths. I ended up using the shorter of the two.
