You should assemble the VDO pressure sender.  Screw the pressure sender (green) into the angle adapter (blue) and tighten until it's snug (don't overtighten).  Now, you'll need to cut two wires and attach them to each terminal of the sender.  The first one should be about 1.5 car lengths and the second can be 6 inches.  The longer one will feed into the oil pressure gauge and should be fastened to the "G" terminal of the sender.  Then, fasten the shorter wire to the "WK" terminal.  Next, take the bolt (white) that goes through the angle adapter and put it through one of the crush washers (red).  Then, put the bolt through the angle adapter and put a crush washer (yellow) on the other side of the adapter so that it looks like (in order): bolthead (white), washer (red), adapter (blue), washer (yellow).  Now that the sender assembly is complete, position it so that you can bolt it into the oil filter housing.  I was only able to find one position that fits.  Once you've positioned it, crew the bolt in by hand, but don't tighten it yet.  The position I found gets close to blocking the alternator connector so you want to put the connector back in before tightening the sender assembly down.  Once everything is ready, use a 19mm socket and tighten the bolt on the sender assembly.  There is a torque spec. for this bolt, but I have no idea how you can get a torque wrench in there to begin with so I just tightened to the point where I could feel the washers begin to crush (that's  why they're called crush washers).