I did some gauge work on my 2005 Gmc Sierra and it was not bad. The cluster comes out really easy on those I don't know about the Impala though. I bet it is filled with the same crappy bulbs and stepper motors though. You can use a simple iron and cheep copper solder sucker mesh to get the old bulb out and then just hit a couple drops on the new bulb pins and it's good. The stepper motors that move the guage needles are a little more work, but I did all 7 gauges in my Gmc while I had it apart, even though just the tach was dead, it was well under $50 even buying a new solder iron. They may have finally switched to a new design by 2006 but the 2001-2005 are just junk. It's weird where a company will go to save $5 on a $30,000 rig.