Before Installing used Cluster, whether its from M series or not, First it needs to be "Virginized".
Clusters save information about mileage and VIN number of the car in the chip, which can not be modified by coding or programming.
In order to make it usable, this information needs to be deleted from this chip, and after installing in the car, with simple coding, Cluster copies this information from other modules and its ready to work.
When Cluster is installed without "Virginizing", First of all, mileage is not correct on odometer,
and then there is tampering dot next to odometer.