Utterly safe to rename FSX.cfg to FSX.cfg,bak
Addon lines are limited to gauges, so please do treat fsx.cfg rebuild as first, most important step.
The rest is this usual Jesus rubbish. If you don't know what a line says and does, do NOT include it. I simply don't care that Jesus or Mohammed, Krishna or Satan tells you to use. IT IS NOT RELEVANT.
START with a basic FSX.cfg element.