Mike has stated before that he will not be adding a speedometer since you can find scripts that do that already.
However, I do agree about being able to see how damage your vehicle is (probably near the fuel bar) especially when you are flying helicopters or planes where there is no way to tell how damage the vehicle is. If this suggestion is denied, it probably will be because of the speedometer that Mike will not add to the server.
For future reference, please keep one suggestion per topic regardless of how small it is.