Nishy

Long story short, I was driving down the highway and took a down ramp and hit a broken piece of curb that was in the middle of the road. Nothing happened to my wheels or tires, nothing happened to my suspension or brakes or anything in the wheel well where it hit... But my tach and speedo instantly dropped down and went limp. They barely move. If I'm going 90 the speedo says 5 and the tach just vibrates a little. What could I have broken to cause that?