Hi! The sticky won't open forme either, this problem is a known one and is pretty common.
For the 94-95 Impala SS and 94-96 Caprice:
Most often the digital module is at fault and it cannot be fixed.
it needs replaced. easy job, don't even have to remove the cluster. Remove bezel, glass, cluster overlay panel and digital module (4 screws).
Second most common the power supply board for the digital module is bad. it's right underneath the digital module, to replace you have to take the cluster out and use soldering iron. 7 pins are holding it up on the printboard.
Sometimes just resoldering these pins helps. electrcal connections can go bad over time.
if you need the digital module I have several for $55 + $7 S&H.
let me know what your milege is to find the closest match.
For the 96 impala SS: there are three resistors on the back of the printboard, when they go ododmeter goes too. Replacing the resistors is the fix.
Good luck!
George
ImpalaSStudio
Please see all my custom Impala SS items here:
http://stores.shop.ebay.com/ImpalaSStudio__W0QQ_armrsZ1