Well you are done (lets hope). Put the key in the ignition and turn it and see if the console powers on and reads the temp properly (it will read 0 degrees if it isn't hooked up correctly).
Go find an abandoned parking lot and follow the following steps:
Press and hold the "MODE" button until you see "VAR" (takes around 5 seconds)
Release the "MODE" button. Push the "MODE" button until you have selected the zone you are currently in. (email me to find out your zone, I'll soon have a map up)
Release the "MODE" button and wait until the console is back at normal operation.
Press and hold the "MODE" button until you see "CAL" (takes around 9 seconds)
Release the "MODE" button.
Now the fun part. People will think you are crazy. Drive in a circle at around 3mph. Your console will be changing direction really fast. Continue to do this until the console is back at normal operations.
It was in the 1998 Ford Explorer's manual found here