like spyder said, i bet you it's the sending unit. a kind gentleman who helped me out while stranded on hwy 1 described the exact same problem and he told me it was just that.

as for vibration it's nothing to do with worn tires.... them tires/wheels are not balanced right.

 

That is not necessarily true. While that is definitely a cause of the syptoms, it is not the only cause that has the symptom...

I had conti's worn to the wear strips and they behaved this way untill they warmed up, and still slightly even when they allready warmed up...

Indications point towards a balance problem based on the noticeable difference at a certain speed, but the loudness of the tire leads me to think they are worn and may not ONLY be out of balance...

Of course it could be a combination of the 2!

 

(umbilical cord) love it. Why can't I think of **** like that.