The sensor is not too difficult to replace. Removing the plastic shield over the engine will give you a bit more room. The job is definitely easier with the proper socket. They sell special sockets for these sending units. You may be able to use a conventional socket, just check the fit on the new sending unit before crawling up on top of the engine and finding out it won't fit.
Tighten the new oil pressure sensor to 20 Nm (15 ft. lbs.).
So i don't need to remove the intake manifold to get to it?