If you want to perform repairs on your Triumph Bonneville T 100 then it is always a great idea to have access to a Workshop Manual to keep just for personal reference in case you need to know tips on how to remove a certain part for example Dashboard and install it again the right way.
Triumph Bonneville T 100 Workshop Manuals offers you distinct diagnostic info on your car therefore if something is faulty it will help you identify what the problem is and tips to fix it. Then you are able to determine if you can do this on your own or that the job is simply too big you could make a reservation for your Bonneville T 100 in with a decent friendly mechanic.
Triumph Bonneville T 100 manual