There is an oil pressure socket made by various companies (Lisle, Craftsman, Snap-On, etc.....). You can pick one up any local parts store or Sears, etc....
As far as using it.......most likely the oil pressure sensor (OPS) is turned in a direction that limits it's clearance with the firewall. Therefore, just popping on the socket and taking it off is not gonna be possible (most likely). You'll need to loosen the brass elbow that threads into the block (and that the OPS threads into) about 1/4-1/2 turn and face the OPS towards the passenger side. This will give clearance to put the socket on.
There are other methods (I was able to break mine loose from above with a wrench w/o having to move anything), but this one has always been feasibly easy for me. Careful with the brass elbow.......a decade or more of sitting there and it likely is seized pretty good (and brass is very soft and easy to twist off). Throw some PB Blaster on it, let it soak, and attack it. Have a screw extractor set and a spare brass elbow handy just in case. :wink:
BTW, remember to unplug the connector first.
Hood