It's the stepper motors. $5-$10 each on ebay. you can get the gauge pod cheaper than $650! and while it's off you can add what ever color lights you want!

http://www.ebay.com/itm/2003-2005-CH...ht_4556wt_1270

Has trans temp.

http://www.ebay.com/itm/06-07-CHEVY-...ht_3166wt_1075


or you could try contacting USSpeedo and ordering parts from their distributors.