I would expect that you only need one dial indicator. I don't know of a Benz that has ever been produced with a timing BELT rather than a chain. That's one of the reasons that I drive a Benz.

Good luck,

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Larry Bible
'01 C Class, Six Speed
'84 Euro 240D, manual, 533K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles