I had the Silverleaf system in our plastic Country Coach that I ran on a small laptop mounted on a stand to drivers right. I also ran DeLorme Mapping with their GPS, split screan with the Silverleaf. I was neat having all the information from the system and it maintains a history like the Detroit system. With that setup, I had three speed readings, which were always within one MPH of each other. I left it in the coach when we sold it because there is just not room in the Liberty for a computer stand. It may well have saved my engine last week, but I will never know.