The dash guages & PRNDL indicator are out. The check engine light is not on. They did this once before, but came back. Now they have been out a few days.
-   All my gauges have gone out. I've had 1 diagnostic test done on the tachometer which cost me 79.00 and they are telling me that i will need to have all the individual guages done @ 79 bucks each!! can someone help me? -   Guest
The gauges are available for as little as $3 each on eBay. Replacing them will require the removal of the dash cluster and desoldering / soldering skills. Seach the phrase "GMC stepper motor" (without the quotes) on eBay to find them.
Also, http://forums.trailvoy.com/showthread.php?t=48886 has a write up on this very issue. You will need a free account to see (and post if desired) the discussion.
try resetting the computer, by removing the positive battery cable for 10 mins, if this does not work, then you more than likely have a computer problem, as crazy as it sounds, your computer makes those work.