My speedometer was fine till last weekend...all of sudden it reads high, then higher, then spins almost all the way to almost zero and sticks (round 140 mph GT cluster). I pulled the cable out from the head end and lubed it, same thing again. Tried to pull the cable out of the trans end, it's in there with some kind of blue sealant, and wouldn't budge, at least not without a harder pull than I was willng to risk. So, do I replace the cable and gear, or does this sound like a speedo head problem? Sorry for the dumb question, I'm a first class doofus mechanic. Thanks for the help.