diff --git a/README.rst b/README.rst
index b72fbb1..42f7ae6 100644
--- a/README.rst
+++ b/README.rst
@@ -16,5 +16,8 @@ Usage
 You can use the Docker container which is published to ``vexxhost/tempest-pushgateway``
 and provide your OpenStack creentials in the environment, alternatively you can
 simply install this locally and call ``tempest-pushgateway`` directly.  The
-only requirement is to set ``TEMPEST_PROMETHEUS`` environment variable to point
-towards your Prometheus Pushgateway.
+tool is entirely configured using environment variables:
+
+- ``TEMPEST_PROMETHEUS`` (required): Prometheus Pushgateway address
+- ``TEMPEST_HORIZON_URL``: URL for Horizon if ``python-tempestconf`` fails to
+  detect it.
diff --git a/tempest_pushgateway/__init__.py b/tempest_pushgateway/__init__.py
index 77038bc..8ab9b14 100644
--- a/tempest_pushgateway/__init__.py
+++ b/tempest_pushgateway/__init__.py
@@ -97,11 +97,21 @@ def main():
     tempest_conf = tempfile.NamedTemporaryFile(mode='w+')
     accounts_file = tempfile.NamedTemporaryFile(mode='w+')
 
+    overrides = [
+        ('validation', 'connect_method', 'fixed'),
+    ]
+
+    if os.getenv('TEMPEST_HORIZON_URL'):
+        url = os.getenv('TEMPEST_HORIZON_URL')
+        overrides.append(('service_available', 'horizon', 'True'))
+        overrides.append(('dashboard', 'dashboard_url', url))
+        overrides.append(('dashboard', 'login_url', url + '/auth/login/'))
+
     cloud_creds = tempestconf.get_cloud_creds(args)
     tempestconf.config_tempest(
         cloud_creds=cloud_creds, convert_to_raw=True,
         create_accounts_file=accounts_file.name, debug=True, non_admin=True,
-        out=tempest_conf.name, remove=[
+        out=tempest_conf.name, overrides=overrides, remove=[
             'network.floating_network_name'
         ]
     )
diff --git a/tox.ini b/tox.ini
index 7641909..c3a8aa9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,6 +2,7 @@
 usedevelop = True
 passenv =
   OS_*
+  TEMPEST_*
 deps =
   -rtest-requirements.txt
   -rrequirements.txt