Setup SSH tunnel with paramiko to access postgreSQL

I currently use paramiko to access an SFTP server and connect to the postgreSQL on the same server. I found many examples using sshtunnel to log on postgreSQL but I don't know how to do it with paramiko

currently my code looks something like:

    # establish SSH tunnel
    self.ssh = paramiko.SSHClient()
    self.ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    self.ssh.connect(hostname=host, username=user, password=password)

    # setup SFTP server
    self.sftp = self.ssh.open_sftp()

    # connect to datebase
    self.engine = create_engine('postgres+psycopg2://{}:{}@{}:{}/{}'.format(user, password, host, port, db))