This is an excellent way of getting your head around a few issues at the same time Wing-man
If it's the Engine Exhaust System we're dealing with, get
ees_v32.zip off Radarman's link, it's the most recent and complete version. I have a hunch it's also the file Jon is referring to with the 22 page manual. It took me months to gather up the courage to wade through that manual one day for "just a bit of smoke".
I can assure you though it's worth the effort
First of all, the manual is very well written and it's best to be kept rather than discarded for future references. If you're prepared to set time aside to study the manual without skipping paragraphs, you'll be surprised how things start falling into place and you'll wonder what the apprehension was all about.
After you've edited the aircraft.cfg's of more than one of the aircraft on the list, it becomes evident why no-one has written a self installing add-on... trust me. You can't do any damage really, as the few 'effects' and 'gauges' to be added have been reworked and tweaked over and over by the author. I've never experienced any problems or conflicts at all.
Though, needless to say, you'll back up your .cfg files before you start editing, you'll probably find that in some instances you won't even bother after a while, because in cases where you only add lines instead of changing existing ones -- you'll remember what you just added anyway.
My compliments go to Martyn Becker for a great effort and a Manual so well written that even I can understand it