The Gepard (both variants) of the german tech tree has originally -10° degrees depression and not -5°! Secondly the turret turns 360° degrees in 2,5s. That should be 144° degree a second and not 73.8°!
Source: Carl Schulze: Gepard. Der Flugabwehrkanonenpanzer Gepard im Dienste der Bundeswehr. Verlag Jochen Vollert – Tankograd Publishing, Erlangen 2018, S. 3f
2nd source: Datenblatt des Schleifringes des Gepard-Turmes, 2018, March