Did you run the EZCA config tool after installing the 777? You have to run it once, so that the EZCA parameters get written into the aircraft.cfg. Hint. Run it as administrator.

If you still receive the problem, the nature of it may look as follows. When you are in an external view via the default FSX commands, only the external model gets rendered. So there are no VC details and gauges to be seen. When you now (still being in the external view) alter the camera position to some 'VC' coordinates, there still won't be a VC but only the stuff from the external model.

To solve the issue, make sure to run that mentioned config tool (you only have to run it once but you can run it as often as you like) and also mind the view mode FSX is in. That mode defines if you e.g. receive a fully detailed VC and a reduced external model or the full external model without VC details. With EZCA being properly initialized via its tool, the change should happen automatically.