You have posted in the "tech" section.
OK. here you go. There are grounds located all over the car. One ground (G203) is located behind the center console. G203 is shared with the radio. So if the ground was upset during the radio install, this could be your problem.
Most devices in the car can not work correctly if not well grounded. The cluster is grounded via G203. Make sense?
2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.