For BMW E38 users and buyers
i had a BMW with some problem in odo reading display and i asked around why isnt display clear, i didnt get a clear answer as no one gives a straight answer here to avoid being questioned later that " you said that to me on that date"
so in order to change the odo display i read the wiring comes from ecu, so when you change the odo in 7 series it will still show the same reading, and ecu of BMW is linked with VIN number of car , result is the whole car is connected to its VIN number and to change a part you have to send in the VIN number to BMW for correct pre setting before installing that display wired to ecu