Something I completely forgot about is I use a program called FSPANELSTUDIO It works with all versions of flight simulator this program allows you to edit change or create panels and gauges in any aircraft you have and it will let you know if you are missing a gauge. The best part about this program is you actually see the panel you will see in FS and if you want to alter an existing gauge all you have to do is to click on it than you can move it re shape it and even delete it and you do not need any degree to use this program as it uses what is called a WYSIWYG system which stands for WHAT YOU SEE IS WHAT YOU GET. Now mind you this program will not alter 3D panels as they are part of the original design process. It just does not get any easier than this
here is the link.
There is a try before you buy option
http://fspanelstudio.com/