Given up, sorry. The HW_MD11_ND gauge works fine. But even after a reinstall of V1.8 I still cant get the C17 MFD to display anything.
Ok I see the problem. I forgot the C17 gauge was made originally for AlphaSim's product.
You have to add a 5th parameter to display it, you also need the 1_WN param to display the PFD in a popup window.
window_size= 0.250, 0.250
window_pos= 0.000, 0.000