00 audi a4 1.9tdi. when I start my car my rev and speedo jump about for approx 5mins, then when it stops my rev and speed is wrong I could be sitting idle doing 100mph wit 5000 revs etc? I tried to change dash bt car wudnt start. then I change ecu,dash and key barrel and still wudnt start? do I need to programme it in or any ideas?

 

any help