Hi there. I have been reading alot about the speedo needle that jumps on the 2002 elantra gls while driving. My speedo is doing the same thing and I have been told it could be the VSS , the auto trans sensor, the vss sending unit. speedo guage etc. Can anyone out there give me their experience with which sensor to start with or how to test ? I assume they are on the tranny cover which I have not looked at yet. Thanks.