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Old 02-06-2015, 10:38 PM
ROLLGUY's Avatar
Join Date: Oct 2007
Posts: 5,909
Originally Posted by tyl604 View Post
Does this also work for the 300SD 1981? Or is the SD different?
The SD has plastic gears that go bad (ebay has them), and is also an electronic speedometer.
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Old 02-07-2015, 04:51 PM
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Join Date: Jul 1999
Location: San Francisco, Ca
Posts: 2,284
tyl604, in that case you can also try the junk yard for a spare speedo (parts).

Good luck.
1979 300D 199 K miles
1995 C280 95 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles
1979 240D 140Kmiles (bought for parents) *SOLD.
1989 300SE 148 K miles *SOLD
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Old 02-07-2015, 05:31 PM
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Join Date: Dec 2010
Location: Johns Creek, GA
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The Benz-Store
Chamblee, GA 30341

Benz Store | Mercedes Benz Parts and Accesories | Buford Hwy Chamblee Georgia - Home
1981 300D 92k miles (daily diver)
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Old 02-08-2015, 11:34 AM
JamesDean's Avatar
Electrical Engineer
Join Date: Apr 2005
Location: NE Ohio
Posts: 5,008
Originally Posted by tyl604 View Post
Does this also work for the 300SD 1981? Or is the SD different?
As mentioned before the SD's speedo/odo are drive by electronics and have plastic gears for the odometer. I've done a fair amount of work on these and if you're interested would be happy to go through yours and fix it up.

Here are some photos from an 81 I worked on. He was having problems with his odometer not keeping proper mileage. Was an interesting repair. He was also interested in adapting a 160 MPH speedometer for use in his SD. I ran out of time on the project and didn't get a chance to fully figure out the needed changes.

W126 300SD (1981) Instrument Cluster Refresh RT - Album on Imgur
Cruise Control not working? Send me PM or email ( I might be able to help out.
Check here for compatibility, diagnostics, and availability!

82 300SD 145k
82 300SD 265k
87 420SEL 230k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
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Old 02-08-2015, 04:57 PM
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Location: Atlanta, GA
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Thx; still considering.
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