I have a stock 2005 LLY Crew. Recently, the speedometer quit working. when it does work, it acts as if the needle is not moving smoothly. Has anyone else had this problem? Where is the speed sensor located? I'm not into choking up a bunch of $$ for a new instrument panel, how hard is it to hook up an external speedo? Do the programmers you cats use have a speedo on them? Just a few questions. Any help would be appreciated.