The display works. The existing hole needs to be slightly enlarged, and the rear connectors need to be relocated. I removed the old connectors and screwed them onto the new display. This way, the existing cables fit the device again.
The ad is slightly larger than the original. Therefore, the bracket must first be widened. The electrical connections can be adopted after modification. However, no adjusting screw or similar can be found, so that calibration cannot be carried out. In my display, this leads to the fact that up to 12 emptied tank is continuously displayed as full. I didn't want to take the risk of how exactly the ad is empty until now.