OK, my wife was driving the car (98 SVT) the other day and all of a sudden the speedo starts going crazy, jumping up to 160 and back to 20 then up to around 140 again and back down. At the same time, the Tach starts to die out to nothing. after a few minutes of this, the car dies and won't restart (it would turn over fine). She sat there for about 45 min and eventually the car restarted like nothing happend. Does anyone know what might have caused this? Could it be sometihng with the speedo sensor? Don't know if that would cause the car to die, but I have heard that they fail often in higher milage 'tours. (mine has 116K)

Thanks,
Brad