Touareg: 2013 V6 TDI
Join Date: Nov 2014
Location: Winnipeg, Canada
Second Vehicle: VW 2
Thanked 54 Times in 52 Posts
I used to design instrument clusters for construction and ag equipment. Usually there is a zeroing procedure at time of manufacture, but nothing available once the unit is installed. Zeroing is either overdrive the pointer against a pin while it slips on the motor shaft, or setting zero with a jig. Our tachs have no zero pin. Some stepper motors have an internal zero position, but most do not.
I would say that your pointer became loose at some point and slipped. Now it is stuck with the motor in the correct zero position, but the pointer has moved. The only way to fix this would be to open the cluster and move the pointer manually, then pushing it on solidly.
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