Radio is making a fuzz and speedo is actin like rev counter

Hi ya guys, just looking for a bit of help. My radio is making a buzzin noise, wen i rev the car the buzzin goes higher as the revs get higher. Plus at the same time this started so did the speedo, it bounces up and down. If im doing 30mph the speedo says 60mph. Has any 1 come accross this problem? Thx Lee