If you have to execute auto repairs for your Tomos BT then it is always a good plan to own a Workshop Manual to use as a reference just in case you want to know how you can take out a certain component for example the Dashboard and fit it again in the correct manner.
Tomos BT Workshop Manuals are able to offer detailed diagnostic guidelines for your vehicle so if something is not working it can help you understand what the issue is and methods to resolve it. After that you can assess if you can do this by yourself or that the job is too big you are able to make a booking for your BT in with a suitable car garage.
Tomos BT manual