There's a few around... as far as installing the gauges... are you flush mounting or recessing the gauges behind the factory bezel?
Here's a "How to" for both.
73-87.com Recessed Gauges
73-87.com Surface Mounted Gauges
As far as wiring, from everything I have read the Painless wiring harness kit for these gauges is hands down the only way to go. I just ordered all my gauges as well, along with the speed sending unit, the painless kit, and the Billet bezel insert from LMC to make it look much cleaner, i'll have my step by step and pictures on here soon.
Here's a link for the wiring kit.
Jegs - Painless Wiring Kit
Also, Here's the thread Kenm78 just did a week or 2 ago with his install...
Ken's Install Thread
Hope this helps you out, I know all the site's I linked here were a big help in making my decision, and will be a huge help with my install.