I have a 97 2W DR Sierra and I think I'm having dash cluster issues, and was looking for confirmation. My fuel gauge goes bonkers occasionally (spins around) and my speedometer is getting much worse. when I first noticed it, it was reading 10mph faster than I was actually going. Now it is reading much faster than I'm actually going, So bad that when I'm doing 30mph it reads 55-60 mph. Would this be a cluster issue or an auto transmission issue? Are these trannys electronic or mechanically driven? Any help or response would be appreciated.