– FSX Corrected SDK Gauges.h File flight2000it 18 years ago FSX Corrected SDK Gauges.h File. The FSX gauges.h file updated and corrected so that it is backwards-compatible with FS2004 code. By Dai Griffiths, Dragonflight Design. 50 Kb FSX/FS2004/P3D/X-Plane – FSFO V3FSX/P3D v3,v4 – Vought Corsair F4U-1a Model CorrectionFSX – Firespray 31X