You may need a new/used cluster or you can pull the cluster and take/ship to a VDO repair place. What may have happened is when he was trying to "crook" the mileage(soldering wires onto the circuit board) he messed solder on the board. He could also try cleaning and see if it works.

Like Twins said you have to recode in more than one location or you going to trip the tamper light.

Buy from the recyclers the cluster and the LKM unit.

US Customs may notice the discrepancy in the mileage when compared against the vehicle's title and the date of sale.

Paying the tax ensures a better nights sleep.

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