If one installs accusim patch v.1.52 AFTER the C172 Patch v.1.03 The Cessna's avionics stack is dead. reinstalling patch v.1.03 does the trick. The rest of the A2A hangar seems to be fine with that (that's basically all things accusim in my case).
It's exactly my case too. You can also see on my screenshot that the model is running somehow. Just not the gauges. I'm using FSUIPC, but i only use it to "curve" the joystik input to make it more linear.
*EDIT*: In the 2D gauge it shows that the radio stack is on or off, and by clicking on on or off the buttom on the stack moves acordingly. however, i cannot set any frequency other than the default one. Clicking on the toggle button between the two frequencies confirms that the button is pressed, however, the fraquency is not changed. *EDIT*
Getting back to the C172 and now I'm getting this same issue.
Flew the C172, went to the civ P51, applied core update to get ground steering back and now the radio stack is dead.
Regarding FSUIPC, is that a known issue affecting this?
Edit: It appears as if the model is running - cycling power either through the avionics switch or the unit power switch activates/deactivates the 2D popup- but the gauge itself is effectively dead.