Trying to answer original Carlo's questions...
If you look at the docs, 02 63 is a (fatal) randomly generated failure, which could in fact be triggered also by some unusual situations (so wrong conditions) of the INS.
If the 02 63 you experienced was in fact triggered by the random failure generator then you were simply not very lucky

, the virtual hardware you had on board failed, it may happen!
> I found out that when saving the flight the info of the INS is not
> saved at the same time, so that has to be done separately.
There is a specific procedure to save INS state, see SituationSaveAndReload.pdf
> This means I have to align the INS again using this airport
> coordinates.
> Here is where the trouble starts.
Are you sure you entered them correctly?
> Then there is also the situation of putting the gauges at some place
> on the panel. How do I find the coordinates for the spot where I will > have the gauges.?????
There is a "trick"! You should locate the panel main bitmap, which is generally in the same folder where the panel.cfg is. If you edit it with any image editing or viewing software, you could easily find out the coordinates of the UPPER RIGHT corner where the gauge you want to place should stand. You could also, from that point, open up a selection as a rectangle, to find out height and length you'll have to specify, in panel.cfg, as gauge's dimensions. You will for sure not get them right at the first try, you'll need some more tries to refine the coordinates, but it is quite easy. Otherwise you can buy FS Panel Studio.
Regards
Marco