I also have CS 727 and 707 in P3D.They are perfect. Some reason 777-200 1.2 has problems.
Before  every time when I started P3D with 700-200 P3D crashed.
Thanks to Markoz  found the problem and solved with small changes in Panel. cfg file adding  " // " beginning of " gauge02 line"
I am sure he will also find a solution for 777 1.2
:D
[Window00]
file=bg.bmp
background_color=0,0,0
size_mm=1024,768
window_size_ratio=1.00  
visible=1
ident=MAIN_PANEL
render_3d_window=0
window_size= 1.000, 1.000
window_pos= 0.000, 0.000
gauge00=Captain_Sim.x777.sys!main, 0,0, 1,1
gauge01=Captain_Sim.x777.sound!main, 0,0,1,1,Captain_Sim\777\sound.ini
//gauge02=Captain_Sim.x777.update!Main, 0, 0,  3, 3[/b]
gauge03=Captain_Sim.x777.wxr!main,1,1,1,1