My gauges have all stopped working over a years time.im going to replace it soon but have a strange thing happen today.at the digital display area,the letters A and G appeared .nothing else,just A and G.right before that happened,symbols and numbers and letters flashed across screen of display ,happening once or twice a day just out of the blue....the ignition is off ,as are interior lights,but that A and G are still on there.ANY IDEA OF WHAT IT IS

 

1999 to 2006 model year?