I not sure if this belongs in here or ice but the mods can move it, so here it goes:

I have fitted a aftermarket headunit, therefore losing the track and radio station display on my mfd, I heard that you can buy a box that plugs into your pc by usb, you then program it with a message then wire it into your mfd and it will display the message.

Any truth in this, if so where do I get on from.