Hey.
To get that dash pad off/on you will need to pull the cluster. To do that you will need to drop your column so you have clearance to get the cluster out. Don't worry to much about gauges not working or stopping as you will find there are many simple repairs to keep them working properly. If your careful when you unplug it and use some dielectric grease when you re-plug the terminals you will have some protection for the future.
I agree that there is nothing worse to look at than a cracked up dash. It's right in your eyesight all the time unlike a dent on the passenger side quarter.
If you pull the cluster one of the best and simplest mods is to ground the circuit board via a wire to the sheet metal. The gauge need a good ground ref to operate properly and the screw connection that bonds the cluster to the sheet metal is often compromised by corrosion.
Also if you remove your driver seat you will have a 100% better time getting under the dash and not breaking your back. Only 4 nuts and you open up a ton of space to work.
Second best mod would be to install a set of relays and reroute your power to the lights. There is a member on here that makes and sells the kit or they are easily available on ebay for under $30.00.
Third is to ditch the ammeter and install a voltmeter. Once again there are many threads here to guide you through the process.
There are many, many more simple yet effective mods....hell someone should write a book called 101 effective mods for your a-body.
Good luck and remember to post pics of what your working on when your asking questions.....they really help the other members when they are trying to help figure out your issues.
PO
Mop