These guys have the custom gauge cover and can supply the LED's.
http://www.caribbeancustomdesigns.c...n_page=product_info&cPath=1_25&products_id=33
It is really not that hard to do, soldering is easy. The hardest part is to recalibrate the speedometer after taking the needles off. It help if you have a long straight road and a GPS with speed display.
I done it with my Celica and plan to do it with the Corolla as well.
The LED's were so bright it created a halo around the centre of the needle and emitted some white light either side of the needle which looked cool when revs going up and speed going up

This was with the needles off.
I had to scrape off the orange paint on the back of the needles and re-paint with red.
I have a guide on how to do it but don't know how to post a link to a word document on here.