Hello Jan,
You can precisely adjust the camshaft timing using a camshaft alignment tool.
The corresponding tool (OE part number T10098 A) costs around 20 euros.
The pump is adjusted to 0.70 mm +/- 0.02 mm using a measuring instrument.
The fuel injection system is checked using a diagnostic tool.
You can find the tool here in the shop, as well as further support.
https://shop.dieselschrauber.org/en/vcds-diagnose-fuer-audi-seat-skoda-und-vw-c-23.php
Best regards,
Michael.