There are four (4) 10mm bolts that hold the housing onto the engine block. There is an oil psi sensor that has to be unscrewed from the stock housing, and reinstalled into the 2.0 housing. It took me 25min to do the swap while my oil was draining from the sump.
You need a 10mm socket, ratchet and some extensions ect. "I think" the oil sensor is a 13/16" fitting, so you'll need a wrench for that. You'll need some Teflon tape to wrap the oil sensor so it doesn't leak when you reinstall it. (you can get this at any plumbing store for a couple bucks) That's about it. Just make sure to do the work when the engine is cool (because its aluminum) and most importantly..........DON'T OVER TIGHTEN THE 4 BOLTS WHEN YOU INSTALL THE NEW HOUSING!! Again, the block is aluminum, and the bolts need to be tight, but not TIGHT!
I torqued my bolts to 14 ftlbs and I have never had a leak what so ever. If you can change your own oil, you can do this "mod"!!