Hi----I came across instrument cluster for sale at price to good to be true. all the instruments are in almost new condition showing only 36,000 miles, however installing them on vehicle with different mileage how do you correct that error . Is part number same for all 1969/70 [Shelby and Mach 1] and are there production dates on instrument. I read about color o wood inserts on early 69 cars is light teak, or is there any other way to tell them apart.---Thank you