AC Trinary Pressure Switch for 88-91 Vanagon

This is the trinary pressure switch (hi/lo) for the late model Vanagon AC system.  This switch will not allow the compressor clutch come on if the pressure in the system is too low or too high.  The early AC (83-85) had no pressure switches and you can't add this to the system.  The AC from 86-87 had two switches.  You could replace both of them with this one if you are willing to rewire some things.