How can I connect my Mojo to a real leslie speaker?

The only instrument we used to make with the direct connection for a leslie speaker was the Crumar MojoXT: it had a 11 pin connector. It is really important to understand that the only modern standard for leslie speakers and rotary speakers in general is the modern 11 pin. All the other standards (5 pins, 6 pins ecc ecc) are old and potentially dangerous because high votage (115v or 230v) is involved.

Additionally, old amplifiers don't have protection circuits, proper isolation, modern standard features. It can happen that, connecting your instrument to such an amplifiers can cause static problems and lead to malfunctions. If you really want to proceed this way, a passive DI box can help. We can't give support on this kind of connections. If you would like to connect your organ (Mojo Classic or Suitcase, Mojo Desktop or Mojo61) to a rotary speaker with the 11 pin connector, you should consider buying our "Crumar Eleven" adapter. https://www.crumar.it/?a=showproduct&b=40

Attached to this article there's the pinout of the 11 pin connector of Crumar Eleven.