OK, the speedo on our 1992 300E started showing about 2X the actual speed. But now it's getting worse. My daughter said she got passed going 160! Odometer looks like it's working fine. Any thoughts?

BTW, every once in a while it goes back to working fine.

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Bill Streep
San Antonio
'57 190SL (toy)
'08 S5500 (mine)
'09 CLK550 (wife's)
'06 SLK350 (daughter's)
'11 GLK350 (daughter's)
'03 CLK310 (spare)