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Weird gauge movement in my 2020 Corolla

  

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I have a 2020 automatic corella le. With the car off and if I push the turn signal the tack needle will fluctuate for a second or two. If I try it right after it will do nothing.  If I  wait a longer time , perhaps 20 minutes, the needle will fluctuate again. During this whole time the car is never started. It does not seem to be causing any problems  but I am wondering why it does it in the first place. 


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poor grounding on the instrument panel


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