Whats the point in tacho metres in Poland anyway?
The new digital ones are next to impossible to fiddle, because there's quite a compehensive audit log with them. The law now is that you can be busted in any EU state for tacho offences, even if they were committed outside of the country where you're stopped. For example, if you disabled the limiter and went at 100km/h constantly on Polish roads in the truck - you get stopped by the Germans and bang, that's you in trouble.
Part of it involves having to set the machine every time you cross a border, so if (for instance) you were doing 90km/h constantly on the road between Swiecko and Nowy Tomysl, yet the limit for trucks is 80km/h - you can get busted by the police anywhere. The UK does quite a bit of this, but stupidly doesn't issue on the spot fines!