@wland
I am using an ESP32 with a modified code from Matthias‘ Autosteer (github/mtz8302). This sends the commands via wifi UDP to a small Wemos D1 mini I have built in in the steering wheel. From this Wemos the commands are sent via a RS232MAX converter to the wheel. So the wheel is only plugged with a power cable. The data transfer also works in the other direction.
To mount the motor on the tractor I use a selfmade adapter and a cheap racing wheel.
Yes, I am sure that the smaller one also is strong enough for any kind of hydraulic steering. (I am not sure for mechanical steering, sry)
In the meantime (I bought it in summer) the software of new ones seems to be updated. Now it should work that the motor gives some feedback for example if you turn the wheel. (My motor has some problems with this feedback)