It's no problem, I am here as long as you need.
With regard to the Service Engine Soon light being on, you will need to get the codes scanned to see what is going on there.... with about a hundred different possibilities to turn the light on it would be more than a bit difficult to speculate accurately at the cause without the code(s). Most auto parts stores (outside of California) will check the code(s) for you at no charge.
The vibrating is a tough call, as it may be related to the Service light (if it is a misfire, etc) or could be completely unrelated (worn motor mount, very common on this model).
The dashboard cover you can use any Eclipse/Spyder dash from 2000-2005. While they changed in small amounts, nothing that would prevent use (some had blue inserts, etc). This dash boards are really
fragile nowadays though, so the odds of finding a good used one are not that great (and if you do it may break on removal). To make matters worse, a new one is ridiculous money (pushing near $1000 last I checked).
You can get "repair kits" in the aftermarket for this dash though which may be the way to go if yours is just broken on the top etc and not major structural. The repair kit is a molded "duplicate" of the original dash top panel that you glue over the remaining parts to give the appearance of an intact dash. I have seen two of these in action and they look good.... if I didn't work on them daily I probably wouldn't have known the difference.Here is an example