F-4E_75_AHUD (Austere HUD) mod   The real Austere HUD modification has been tested on F-4E 68-0304 during 1974-76.
The goal was to have a better sight display, primarily for air to air combat.
Further modifications were made to the radar for a quicker boresight lock-on and new dogfight
scan modes.
The Austere HUD modification remained a F-4E test and didnt went into production aircraft
or upgrades.  
Ive re-created the Austere HUD, using the TW F-4E_75 (required for the mod to work).
Ive used the
Wraparound desert skin for stock F-4E
by amariani
http://combatace.com/files/file/12057-wraparound-desert-skin-for-stock-f-4e/
for a quick "make it fly" setup (we dont have a proper Edwards Test Unit white with red trimmings
skin)   The real Austere HUD was a test setup, so its no problem to add/remove readouts to the HUD modes
to ones personal liking.