Ford GT 40 Workshop Manuals
If you wish to conduct fixes for your Ford GT 40 then it will always be recommended to have a Workshop Manual to keep just for a guide in case you need to know the best way to strip off a particular component like the Dashboard and match it again in the correct way.
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Ford GT 40 Workshop Manuals will give specified diagnostic info for the car so if something is playing up it will help you determine what the problem is and how to repair it. You will be able to determine if you can do this yourself or that the job is just too big you could book your GT 40 into a suitable friendly mechanic.