This is the link to the Digi simulator from the spanish govt traffic guys. The link is to the download which is in english. You need to download the simulator and then whichever tacho make you wish to use.
I have been using the Siemens one for a week or so in demo/ training mode and then in a hypothetical weeks work inc ferry settings, interrupted breaks, overspeed etc. Well worth the price. 
Thanks for that.