I Don't have a route yet because it depends on the seasons and the time of the year I'll finish working. But the main countries will be India, China, Mongolia and Laos. I guess I'll cary a lot of equipment with me because I intend to travel in areas which aren't too urban, so it's better to be prepared.
I think I'll buy a basic multitool for basic repairs (which can be opened up entirely and be divided to pieces) and extra tools for advanced repairs. And again, thanks everyone for the help!