[Mgs] Electrical Problem

[Matthew Milkevitch]

Hello Listers;
   
  While taking a test drive in my '74 BGT yesterday (I was tuning the carbs), something strange happened.  All of a sudden I lost my tach, fuel gauge, temp gauge, turn signals, wipers and brake lights.  A basic check has indicated no blown fuses, and the ground to the back of my tach is tight.  
   
  Any suggestions on how to proceed?  I've had sporatic electrical issues before, but nothing quite like this.
   
  Thanks for the help,
  Matt Milkevitch
  '74 BGT