Accessing Windows install of PostgreSQL via cygwin

I have had a development environment set up in Windows for Django.
Recently I moved all my python/django setup to cygwin because I got
tired of the windows command line.

Everything seems to be working except the PostgreSQL connection. I
understand that I can install postgres inside of cygwin and access it
there, but is it possible to access my windows install of postgres
from within cygwin? If so, how? I get errors trying to connect to
localhost:54

File "/usr/lib/python2.5/site-packages/django/db/backends/
postgresql_psycopg2/base.py", line 98, in _cursor
self.connection = Database.connect(**conn_params)
psycopg2.OperationalError: could not connect to server: No such file
or directory
Is the server running locally and accepting
connections on Unix domain socket "/tmp/.s.PGSQL.5432"?32