Untar the attached file somewhere, then:
1: chmod 644 /path/to/gsi_keys/hostcert.pem
1: chmod 600 /path/to/gsi_keys/hostkey.pem
1: in condor_config set GSI_DAEMON_DIRECTORY = /path/to/gsi_keys
2: in condor_config set GRIDMAP = /path/to/gsi_keys/mapfiles/grid-mapfile
3: in condor_config set SEC_DEFAULT_AUTHENTICATION = REQUIRED
4: in condor_config set SEC_DEFAULT_AUTHENTICATION_METHODS = GSI
and that should do it on the Condor daemon side of things.

On the client side, for simple testing without the need for gsi-proxy-init and friends, you could set the following environment variables for the tools to use:

   setenv X509_USER_CERT /path/to/gsi_keys/hostcert.pem
   setenv X509_USER_KEY /path/to/gsi_keys/hostkey.pem