94 S350 D
Where is the sensor located for the speedometer?

The W140 chassis uses a processed signal fron the ABS computer to the inst cluster for the speedo.

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OK so where is the ABS computer located?

Were you ever able to find out how to repair the speedometer in a 1994 S350D? If so could you guys post it for me?

The sensor (drivers side front) for the speedometer provides a signal to the ABS processor. The output is a square wave. You have to remember it goes thru a lot of wiring and connectors. I guess a test would be if the automatic conrol on the radio works, that would indicate there is a signal from it. MB gives values that can be measured on a volt meter or scope as the wheel is rotated. It also cold be a bad speedo since it is nothing but a meter getting voltage. The abs module is in the box at the base of the windshield in the engine compartment.