The best option I have seen is to tee into the dummy light. The problem is that the threads are bpt and not npt. With some teflon and 1/8npt tee, I have had good luck on my sentra and talon. However, there are many suppliers that have specialty tees that have 1 male bpt, 1 or 2 female npt and 1 female bpt for the sensor.
I'd suggest looking at prices and figure which is better for you. Take a gander at you oil filter housing, there may be an unused hole that has a pipe plug in it. There are too many variations to tell you for sure, but if nothing else, searching dsmtuners may yield some decent results as what you need
-cheshire