Board Thread:Questions and Answers/@comment-116.251.22.2-20161021062946/@comment-27032150-20161123101114

here's a site where you can get all the information you need for the engineers, where to find them, which upgrades they provide and what you need to purchase said upgrades:

http://inara.cz/galaxy-engineers

inara is a very useful site in general, you can use it for almost anything you need to get around in the galaxy!