My labor guide says its a little over an hour in labor to remove and refit. Make sure that is the actual problem but if it is there are many companies that can test and repair instrument clusters. A company called BBA or Google " automotive instrument cluster repair".
Very hard to say. Find an Isuzu or Japanese import specialist or a speedometer shop and get an estimate. If you want to find a specialist, here's a directory link for you: https://repairpal.com/directory?address=98439&car_brand_names=Isuzu