Digital Speedometers MPH/KPH

The speedometer on my motorhome is easy to read whilst driving in the UK (MPH) but in Europe the figures on the dial are far too small to read whilst the vehicle is in motion (KPH). I have looked at purchasing a Snooper 12v device that would give me a digital reading in either MPH or KPH but they all seem to include speed camera dectors which are of course now illegal in France. I am considering purchasing a HUD-e digital device from www.hud-e.com Do any members have any experience of using this device, good or bad?