The Post Scriptum devs released a new update, where finally tank sighting is possible. I left the sighting part out in my original translation, as it wasn't applicable in the game.
However, now that this changed, I immediately went on to translate those 5 pages.
You will learn that distance does not equal sighting distance. You will be taught how to use the sight, so you never miss your shot.
Tigerfibel Single-Page Cheatsheet
A single page you can use as reference while playing, without needing to fiddle around with almost 30 pages. I still recommend reading the Tigerfibel first, as the cheatsheet does not contain examples for calculations.