# Commission Implementing Regulation (EU) 2016/799 of 18 March 2016 implementing Regulation (EU) No 165/2014 of the European Parliament and of the Council laying down the requirements for the construction, testing, installation, operation and repair of tachographs and their components (Text with EEA relevance), Division (398): The following parts shall be sealed:

Extent: E+W+S+N.I.

Any connection which, if disconnected, would cause undetectable alterations to be made or undetectable data loss (this may e.g. apply for the motion sensor fitting on the gearbox, the adaptor for M1/N1 vehicles, the external GNSS connection or the vehicle unit);
The installation plaque, unless it is attached in such a way that it cannot be removed without the markings thereon being destroyed.

---
Source: https://www.legislation.gov.uk/eur/2016/799/annex/1/division/5/division/5.3/division/398 (the official version)
Page: https://openlegislation.uk/eu-regulation-2016-799/annex-1/division-5/division-5.3/division-398
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.