not to be rude or anything, but it kinda sounds like you havnt done any research. if you use the search function at the upper right hand corner you will find just about any answer you need. there are tons of threads on how to tap into the oil system for the turbo and where to tap the return/drain line for the turbo system. the link below is how to install the oil feed line. i know it says for an oil pressure gauge but you use the same source for the oil feed line. its just below your oil filter. the picture is of the oil feed line. i used an electric gauge for my oil pressure, then ran a -3an oil feed line from the second port into the turbo feed port.
http://240sx.cubicdesign.com/article4.php