There are several possible reasons that can cause the gauge files not to load. First, the best hint that they are not loading is that the yoke is deflected fully left. Now for the possible reasons:
1) If FSX or P3D has been installed to "C:\Program Files" or "C:\Program Files (x86)" (these are the default paths of the FSX/P3D installers but it's still a bad idea to put them there), running FSX/P3D as Administrator should solve the problem.
2) The CRJ relies on data from "Documents\Aerosoft\Digital Aviation CRJ", so if this folder doesn't exist, the gauge will terminate and unload. This seems to happen every from time to time and is an issue with the CRJ installer. As Mathijs said, probably the best cure is to reinstall the CRJ as Administrator
3) If the folder is not "C:\Program Files" or "C:\Program Files (x86)" and the "Documents\Aerosoft\Digital Aviation CRJ" folder exists, then it's likely that something else (C++ redistributable files or Simconnect) is missing. In this case I have no idea why that would happen, but I would recommend a reinstall as Administrator as well.