The speedometer / gauge assembly was received from eBay seller. As I was afraid of, the GM CAN computers detected the new speedometer, and the odometer portion of the "replacement" unit would not function. I removed the clear plastic cover from the replacement gauge cluster and installed it onto my existing speedometer/gauge cluster.... (Everything just clips together to form the assembly...)
Everything went back together, but I am sure a GM deal would have to re-set the computer. This was also observed when a dealer installed a steering wheel insert (adding cruise control) to my daughter's 2012 Cruze. GM does this to prevent someone from going to a salvage yard and installing an option onto a car, gaining a "free" option. The dealer that installed the steering wheel insert had to see what "code" the computer generated, then call GM. GM issued a code to indicate to the GM CAN computer that this was a legitimate option addition, activating the cruise control.
Salem, VA, USA
Edited by MRB455, 27 June 2014 - 08:48 AM.