Narco Com IIA Wiring connections?

I picked up an old Narco Com IIA radio.
I'd like to wire it up at home in the garage so I can listen to the
traffic and approach control flying overhead.

I've searched the internet high and low looking for documentation that
would identify the connections on the back. I can't find any, not even
at narco's web site.

There is a clone (tray compatible) radio by TKM (the MX-11) but I can't
find any connection diagrams for that either.

Does anybody have something that would list the connections for this
radio, or at least know a web site that might tell how to hook it up?

I'm assuming I'll need Pwr (+12V), ground, and speaker connections.
Obviously no transmit.

Thanks,
Rod

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