I used the same connecting points that the original tablet screen used. My monitor uses the HDMI cable for video and a USB cable for sending touch inputs to the controller. It does recognize when I touch the screen but most of the time I cannot “Click” on anything to activate it. I did some research and apparently the raspberry pi is does work with a computer monitor just fine, it isn’t fond of computer monitor touch screens. I’m not sure what the difference is but obviously there is something different. Even loosing the touch screen capability, The larger format screen is well worth the trade off at least for me anyway. Aside from that, I’m loving this machine.
By the way, did you know that you can connect to the OneFinity from another computer over wifi and have full control over it? I absolutely love that ability. I can use a different PC to design a project and save the carving file on the PC. Then when I’m ready I can connect to the cnc and upload the file directly to it and start the carve. So far I have found that anything I can do at the cnc I can do remotely from a PC connected over wifi.