Cluster replacement requires hookup to BUDS in most cases. Some firmware versions may not be compatible with other component firmware, unless updated. Some years of clusters may also not be compatible with earlier year's Spyder features, especially for the RT. If it comforts you to have a spare, by all means do it, but be aware of the possible difficulties. BTW, Federal law requires placement of a sticker with the true mileage on the left doorjamb. I have yet to see how that is accomplished on a Spyder. :roflblack: A good dealer will put a label with the readings of both odometers and the date on the back of the speedo, but most Spyder dealers don't bother. If you mark the title with a different mileage than what shows, it may not go further than the new owner reading it and the state recording it. The new title will just show that the true mileage is "unknown" or "incorrect" in most states. It will affect resale value.