There is a Hall effect sensor on the back of the speedo housing that generates 
the signal for the cruise control, I believe.

-D


> On Dec 7, 2018, at 4:31 AM, fmiser via Mercedes <mercedes@okiebenz.com> wrote:
> 
>> Michael wrote:
> 
>> 3.  The speedometer is not registering anything. It’s hooked up
>> at the transmission but I haven’t checked the dash yet.
> 
> I have a nail I hammered square that fits the speedometer drive.
> With the nail chucked in a drill spinning "reverse" the
> speedometer should show forward speed.
> 
>> Cruise is not working. Will cruise control function on this car
>> if all else is correct but speedometer is not functioning?
>> Thanks, Mike
> 
> I'm pretty sure the spinning of the speedometer is what drives the
> cruise control.
> 
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