In E39 BMWs, the tamper light shows up if the VIN in the LCM doesn't match the cluster.
The Milage updates in the whole car, to whichever one is highest, every 100kms... but in the system, that could be in 1 km, or in 99 kms...
I don't know about the Landy stuff, but I used "BMW Scanner 1.4"...