It had been happening sporadically after I reset the trip odometer but now it looks like it could be permanent.

Before sometimes it would tick-tick-tick for a while after I reset the trip odometer but now nothing is going on and the odometer doesn't work either.

I've seen lots of threads for the W123 odometer fixes but none for a W124.

Is there any difference?

Never press the odometer reset button when the car is moving. Just press it again a couple of times with the car completely stopped.

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CENSORED due to not family friendly words

Holy $%^&.

I was always doing it as I rolled away from the gas station.

So, does anybody know of this odometer/gauge cluster is any different than the W123's?

They are different and not interchangeable.

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1987 300SDL 314K mi, counting; #22 Head
1999 E300Turbo 405K original miles
1997 E320 180K mi (Son's)
2002 ML320 (Son's)
1998 S320 140K mi (Son's) sold
1985 300SD 311K mi
1984 300D 324K mi (killed by a hit-n-run turd)
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Good time to paint the gauge needles too while it's apart.

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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

I guess my question should have been whether or not they come apart the same way.

I plan on repairing mine not replacing unless that's impossible.