Is the speedometer have anything electrical at all on It? Or is it 100 mechanical and works off only the cable? I recall an RPM inductive sensor seeing something about that somewhere but not sure if it coeherses with the Speedo. I put in a cable and still don't have a working Speedo. The tab it clicks into is ok and not broken on the trans.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

It can be tricky getting your hand up behind the module to make sure it's fully home.

Check if the square end rotates then go from there.

Don't think there's any electrical stuff in there, could be wrong but pretty sure these things work mechanically, again you can check using a power drill (on other end).

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David


1996 Mercedes S124 E300TD - 129k - rolling restoration project -

1998 Mercedes W210 300TD - 118k (assimilated into above vehicle)

The indication portion of the speedometer is purely mechanical. However there is a Hall effect pickup on the back of the case, that creates a vehicle speed signal. This is fed to the X53/5 block behind the cluster, which distributes the signal to the climate control, cruise control, temperature indicator, and later model stereos.

I would find a small screwdriver bit that fits into the cable socket and carefully spin it up with a drill.

It is entirely possible the cable has snapped within the sheath which would give you no indication.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

I believe Jay when I swapped the engine, i remember taking it out and I think I stepped on it. I wonder if they're that fragile. A Gemo is $9 aftermarket. I may get it and see what happens.

__________________
Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

The speedo cables are not so fragile that you can easily break them, but they can be easily kinked so that the speedo needle jumps around.

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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC

Remove the centre of the old speedo cable , and pop it in to a drill.Put the other end in to the speedo Switch it on and you will see if its the speedo head is faulty or not. Or do it with the new cable to check that out also.