I have just found a link to download a Digital Tacho Simulator on Truckersworld.com.Don’t be put off with it being a Spanish site,the application is in English.You will also need to download the three specific manufacturer demos.Here is the link…fomento.es/MFOM/LANG_EN/DIRE … scarga.htm
Already on here mate 
http://trucknetuk.com/phpBB2/viewtopic.php?t=35157
But I agree its a great link which should be downloaded by everyone! brilliant to just play about and see what happens without having VOSA lube you up for a good time if you get it wrong!
Alex