Connecting over an SSH tunnel

I have a requirement to connect over an SSH tunnel. Is this a supported scenario? How would I accomplish this?

I am going through the 101 video, activate the SSH tunnel, and attempt to connect with great_expectations datasource new. I receive the following error:

Cannot connect to the database.
  - Please check your environment and the configuration you provided.
  - Database Error: Cannot initialize datasource packet_api_db, error: (psycopg2.OperationalError) SSL error: wrong version number
expected authentication request from server, but received S
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