Hi,
If I understand you correctly you have a working application and a local copy of the Opal git repository, and you would like your application to use this local version rather than a version installed from pypi via pip?
The steps would be:
In the python virtual environment that your application runs in
pip uninstall opal
python /path/to/your/local/copy/opal/setup.py develop
Your application should then be using the local copy of the git repo rather than a version from pip.
You can test it easily by running the Django runserver command, making a simple edit to a file in opal (for instance adding a blank line) and checking to see that the code reloader picks this up.
Best
David