This is straight out of the gm service manual:
1.- disconnect negative battery cable
2.-remove I/P upper trim pad
3.-carefully lift the HUD display electrical harness from between the I/P cluster and HUD (if equiped)
4.-disconect the HUD connector from the I/P cluster (if equiped)
5.- remove the IPcluster to steering column bracket retaining screws.
6.- raise the rear of the IPcluster slightley to release the locator tab, then lift the IPcluster to access the electrical connector.
7.- disconnect the IPcluster electrical connector
8.- remove IP cluster
NOTE-- WHENEVER THE IP CLUSTER IS REMOVED FROM VEHICLE, DO NOT SET THE CLUSTER ON ITS FACE FOR MORE THAN 15 MINUTES OR DAMAGE TO THE FLUID FILLED AIR CORE GAGES WILL RESULT!!!!!!!!!
Reverse steps to install
9.-program the transmitters
10.-synshronize the transmitters.
sorry, could not send illustrations--protected.