I have a 1995 mustang with a 3.8L 5 speed trans. It just started a few days ago when I was driving. The speedometer started going crazy. This never happend before. Now it just happens when I put it in neutral mostly. Every now again it happens when I first start driving then it goes to normal when it is in gear. The transmission is fine and not making any noises. The only thing I have no idea what it could be. Can anyone help???