You need to have the cluster memory scanned for LKM fault codes. You'll need the software/hardware package or $tealer/indy with the equipment or a scanner capable of performing a complete electronic systems check. This is way beyond the usual OBD II scanners out there.
When our LKM failed no gauge indicator/warning lights was one of the symptoms.

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2015 X5 xDrive35i MSport
2013 X5 xDrive35i