Hello.
If the kilometers are still counted, the problem is from the velocimeter of the painting.
It is true that some cars use the ABS signal, to measure the speed, but I think not that of the instrument frame, but at the level of control unit.
I continue to lean on the velocimetro of the control picture, I advise you before disassembling that you approach a concessionaire, with the computer you can diagnose the picture and make the needles go up and fall in certain positions, if the tulla does not react you already have it solved, making a diagnosis of the painting should not be very expensive, normally they do not even charge it, it is only a moment. You decide what you want to do.
Luck......