Rattling from speedo

MOA4B9

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I was sitting in the car for over 1 hour with the engine and electrics switched off, only the radio playing and every 15-20 minutes the speedo needle would shake and rattle very quickly for about a second. Has anyone else noticed this? I wonder what that signifies.
 
It's electronic so no mechanical connection so either the head or the sensor? Kinda weird one that...