The odometer, speedometer, trip odometer, radio stopped working

Hi, I just bought an 96 Ford Taurus GL for my niece, bought it cheap. One of the reasons why was because the odometer, speedometer, trip odometer, radio stopped working at about the same time, per the seller. What would cause this? Seems unusual that the odometer would stop working at all, since it's obviously an important function. The seller says she seemed to notice the radio first and then a couple of hours later she notice the sped and odo.
any ideas? Thnx!