the one

Hi all, I’ve searched endlessly. Ran in to a problem with my all my dash gauges going out. Everyone of them stopped working except for the fuel gauge. I get the back lights on but nothing else. No speedo,tach,odo,oil, coolant all dead. I have a microtech lt10, I found a ground wire behind the stereo on the dash bar was some how disconnected, I can’t figure out where is came from. I’ve searched forums pics and can’t find a clear answer. I’ve checked all other grounds under the dash and they look ok except this one behind the stereo. If some can help me out on where this hooks up to, or any insight to the gauges going dead.
Thanks all