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I just acquired an '06 Fatboy about a month ago. I have only put 500 or so miles on it and the speedometer stopped yesterday. The odometer still works. When I turn the switch to the accessory position it turns all the way to 120 mph and slowly drops back to 0. I was wondering if the Softail models and the Fatboys in particular are known to have speedo problems.
I have a 2005 Softail Standard with 22k on the clock. Never an issue with the speedo. Fuel gauge a different story. I also have a 2006 Heritage Classic with 88k on it without a speedometer issue. No fuel gauge issues on this one.
Mine (2004 with 50K) has never missed a beat but the tac is crazy above 3000 in cold weather like it sticks and jumps at 1000 leaps back and forth.. They are servo motor driven by digital input. I would pop the console off and pug and unplug it. Bet that is all it is. Could be the sensor but I doubt it. They do get metal on the pickup and act up however.