just got my 95 wrx import on the road on wednesday and last night coming back from work the speedo needle just started to bounce at 30-35 mph just there. but the rev counter was still going no matter how much stick i gave it the speedo didint go above 35mph. what could it be guys could it be the converter on the back of the speedo to convert it to mph because i think they are mechanical on these. please could somebody tell me what this is cos its doing my head in plzzzz

 

*** in guys someone must know plzzz help!!!!!