While putting in a new battery in a toyota camry the instrament gauges, radio,and all back lights stoped working... replaced all fuses and still wont work

Ok, first (I know it sounds stupid) were the battery terminals put on correctly? positive to positive.. If so, then check your fuses BOth under the hood and inside the car. Check to see if any other devices are supposed to be connected to the positive lead of the battery or any loose non connected electrical wires by your battery. You might have a relay that went out or a short between your battery (and/or battery cable) and your "firewall".