Is it possible to connect GX Touch to Multiplus GX. If yes, how?
Open up and disconnect the internal GX and plug the comms cable from the inverter (ve bus) and the mppt into the cerbo.
If you don’t have a Cerbo - and from your title and post, you don’t - then there is no way of connecting a display to a GX module inside a Multiplus GX.
The Multiplus GX doesn’t have an HDMI port.