I know gatling gun is fixed mounted to the airframe of the plane, thus cannot be rotated left/ right or up/down. However watching DCS pilots dogfighting with opponents they sometimes mention their radar is broken thus have no precision aim on the main gun.
I do not understand how can radar assist you to aim main gun, since only possible gun aim is to aim the plane's nose to the target or offset of the target. I know that fighter jets has a gun tunnel shown on a HUD and that it's up to a pilot capabilities to correctly use this feature. But if I understand the HUD gun tunnel it is just the speed, distance and G force calculation where the bullets will actually fly.