mickyblue:
isn’t there a link to use a digi machine to train on?
Good thinking blue 
Here are some links that should help you learn about the Digital tachograph.
Instruction manuals for Version 1 (The old type of digital tachograph)
The Tachomaster Drivers Guide To The Digital Tachograph
Drivers Short Operating Instructions —Siemens DTCO 1381
Stoneridge Digital Tachograph - SE5000 user manual. (PDF)
Interactive Digital Tachograph Simulator (Direct Downloads)
Install “Interactive Digital Tachograph Simulator” onto your computer first, then either or all of the training sequences.
(These are .exe files so it’s possible that your Anti-Virus program could give a warning )
Interactive Digital Tachograph Simulator v4.exe
Training sequences for the Actia tachograph (V 4.0)
Training sequences for the Siemens tachograph (V 4.0)
Training sequences for the Stoneridge tachograph (V 4.0)
Or You can run the simulator on-line (links bellow)
For [u]Slow or Dial-Up[/u] connections
Instruction manuals for Version 2 (Latest type of digital tachograph)
Siemens Digital Tachograph Instruction Manual (version 1.4) (Latest Siemens Digital Tachograph)
Stoneridge SE5000 Digital Tachograph Rev 7.3 (Latest Stoneridge Digital Tachograph)