If you choose to execute adjustments on your own Diamo Retro 150 then it is always recommended to possess a Workshop Manual to keep just for reference in the event you need to know proven methods to strip off a certain part like the Dashboard and fit it again properly.
Diamo Retro 150 Workshop Manuals provides specific diagnostic information with regards to your vehicle so if something is wrong it can help you ascertain what the situation is and the way to repair it. You will be able to analyse if you can do this yourself or if the job is just too big you can still book your Retro 150 in with a nearby garage.
Diamo Retro 150 manual