As previously stated, all cockpit instrumentation is NVG compatible all of the time, whether in Normal or NVIS mode. The only problems are the landing gear warning light and the galley time display.
Operating with the cockpit lighting in NVIS mode can cause the HUD brightness to be too low with cultural lighting (every frame has a different base level). As a get-around, we cover the landing gear with a glove, and bodge tape over the galley clock. The bonus of this is a hot bacon sarnie whilst on gogs. All internal/external lights can still be operated in a tactical mode in this configuraton.
Once again, the kit procured doesn't work as advertised, but the professionalism/ingenuity of the crews gets the job done.
P.S. The HUD with gogs is superb, and makes life a piece of p**s compared to cyalumes & bodge tape. Read this thread in conjunction with the J SF(or whatever it is being called) one and it all makes sense.