my speed on speedometer is wrong. I drove my A3 1.8T to 5500rpm on last gear (probably around 170-180km/h 112mph) but the speedometer showed just 100km/h (62.5mph). It was ridiculous. I have looked in the transmission and found that the gear wheel that connect with speedometer is broken. It is very funny that Audi's dealer in my country doesnt have this part (part No. V096 409 187) on stock. I dont know why it is broken. Very annoying.

Anyone face this problem? if so please share your view. Thank you very much.