I bought a regular tire pressure gauge for $1.99 at a hardware store. I have been keeping tabs on the pressure. It really isn't much of a vibration. Just slight from 45-65 mph or so. Other than that, it's fine. They probably just need to be balance. Maybe I will get this done at MB. Not a big deal really at all though.
I am glad your MB rus great at high speeds too... what fun they are to drive so fast!!
2006 E350 w/ 155k miles (Daily Driver)
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)