Also dont forget you can repair your srv, even during combat. I've farmed most of the guardian stuff and contrary to what all the pros here say, you will get flipped sometime depending on the angle they approach. If you are really worried about it or bad at flipping yourself back over (using their 'push' while boosting helps) try to position yourself near a structure where you can get an angle on them and shoot but their shots dont hit you.
I honestly had no idea you could repair it during combat, but that's a brilliant tip for the next time something catastrophic happens. I got flipped again getting some more tech pieces but it was as easy as usual to right myself - the thing almost does it on its own (if it's not stuck in an SRV shaped hole). What a difference in ferocity being helplessly stuck and being casually bouncing around makes to your perception of sentinels right?
Thanks for the tip!