There's a number of major errors in the modelling of the avionics stack.
The GTX330 on the left is missing the buttons for the transponder mode operation. I understand if the accuracy of the shapes are a little off but missing the mode functions makes the unit the ability to function without the duplicate transponder panel on the right.
The unit labelled KR87 TSO is also wrong. That isn't the KR87, the device that resembles the KR 87 more is the unit above it. But that panel is also missing a knob too.
There's a lot of other inaccuracies in the visual (and inherently the system accuracy due to the missing controls) of the avionics stack. Hopefully, the team can consider improving this in a future update.