How do I find the battletech manual to learn everthing the HUD is displaying. It looks like there is no link to a manual. Can anyone help?

There is technically no manual, but they did have one for the Backer beta that should suffice, though I am not sure if there were any changes to the game between the backer beta and the full release

https://s3.amazonaws.com/www.harebrained-schemes.com/backer-beta/manual.pdf

There is also this guide created by one of the developers that is basically a manual as well

It goes over the UI, might be more detailed than the backer beta manual

https://steamcommunity.com/sharedfiles/filedetails/?id=1365402907

This is good. I had no idea about guts or tactics. Need to skim through this at least.