Oil pressure sending unit is located near the oil filter - it has a single
wire going into it. Unless you drain the oil first, be prepared for some oil
to come out when you remove the unit. Remove the harness and unscrew the old
sender. You will need to use a deep socket, but I could not find a good fit
with either a metric or a standard one. I ended up using a plumber's socket
(I think it was 1 and 1/32 of an inch, and it was still kinda lose). I
wraped the thread of the new unit in teflon tape, the kind you use for
plumbing, but I think it's better to use Permatex teflon sealer, or similar.
Make sure you put the tape on in the proper direction, so that it does not
bunch up when you screw it in. DO NOT screw it by the plastic part, or you
will break it. The specified torque is 9-12 ft. lbs., but if you don't have
a torque wrench, just hand tighten it as hard as you can.