hallo , how to install Gauges on A340-600

The gauges are probably in a separate file in the Aircraft zip file you downloaded. Unzip the Gauges folder and place it in the FSX Gauges folder (if that is the Sim you are using): example: C:/Program Files/Steam/steamapps/common/fsx/gauges.
Here are the instructions for the A340-600 download for FSX:FSX Airbus A340-600. Model with diffuse, bump spec and night map in Airbus livery. Comes with working virtual cockpit and repainted FSX default 4-engine gauges. Works with SP1 and SP2. Not tested with DX10. By Thomas Ruth.

1. unzip toma346.zip folder to a suitable folder, your desktop for example.
2. copy the sound and sound.ai folders from your default FSX Airbus_A321 into the new Tom_A340-600 folder.
3. copy the following files from your default FSX Airbus_A321/panel folder into the new Tom_A340-600/panel.340 folder:
   airbus_a321_panel_background.bmp
   airbus_a321_panel_background_night.bmp
   Airbus_A321.cab
   do not copy other files from this folder!

4. copy the following files from your default FSX Airbus_A321/texture folder into the new Tom_A340-600/texture.AB folder--note instruction #7:
   Airbus_A321_1_C.dds
   Airbus_A321_2_C.dds
   Airbus_A321_3_C.dds
   Airbus_A321_4_C.dds
   do not copy other files from this folder!

5. create a new folder into your FSX/gauges folder and rename it "tom340".
6. unfold the Airbus_A321.cab into the new FSX/gauges/tom folder.
7. copy all files from the Tom_A340-600/gauges/tom340 folder into the FSX/gauges/tom340 and confirm overwriting all files.
8. move the entire Tom_A340-600 folder into your FSX aircraft folder.
9. Unzip all files from the light effects folder into your FSX/effects folder

Hope this helps.