yes you get 2 adapters 1 for t818 and 1 for the rest

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Yes, you need the latest software for your Baisis.

If you can change the wheel yes, there is even an adapter for the t818 base included.
The important thing is to patch the wheel and the base to the latest version.
But most of the buttons don't work on consoles! at least on the xbox!

Yes, supplied with 2 adapters for belt bases and Dwd t818.

Yes, it comes with two adapters. One for belt bases and the other for the Direct Drive T818.

Hello yes it is compatible, here is what the manufacturer says: You must update the firmware of the base of your steering wheel (T300 / TX / T-GT & T-GT II / TS-XW / TS-PC / T818) with the latest version available.

From support.thrustmaster.com

Greetings