Problem Audi On-Board Computer Problems



I recently bought an Audi A4 1.8T from 2000, with some problems (which I luckily knew from the beginning ;) ). And I would like to solve them easily. One of them would be the fact that the indications of the on-board computer: instant consumption, km remaining until the next refueling, are not indicated correctly (in fact, they are abnormal). I took the car to Porsche Romania for service and the people there told me that the dashboard should be completely changed, because this computer "is gone". The thing is that all this fun is (as you can imagine) quite expensive.

I was thinking if I have an alternative solution, maybe something cheaper: a second-hand board, changing only the on-board computer or I know.....

I am waiting for some advice and suggestions, maybe from those who have had similar problems.