Electrical Advice Needed

I unplugged the radio connector. The dash lights, dimmer, and headlights all work fine. My gas and temp. gauges no longer work. The cluster ground I hooked up was hooked up to one of the gauge posts on the back of the cluster. This is probably why those gauges no longer work. Now what? New voltage limiter? What do I check so I can hook up the radio? Thanks FABO.