Gents
Link to english manual http://www.aerosoft2.de/downloads/f16/Manual_F16_Engl.pdf
Quick basics, Upper left rotary dial on the HUD console turns on HUD. But make sure you have the two switches on the right forward lower console, next to stick, on, then further back on the right consoles there's another 6 odd switches to flick on. Hover mouse over them to see what their function is.