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Old 11-15-2012, 09:26 PM
reinventthewheel's Avatar
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Join Date: Nov 2006
Location: Yucca Valley, CA
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Aftermarket Speedo Gauge?

I sold someone an om617 instrument cluster and they want to return it because the back of the speedometer/odometer gauge is different and the ports don't match.

I've never seen a cluster gauge with ports like theirs, from a 1980 300TD. All the stock ones I've seen are the same.

Is this an aftermarket gauge?

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Old 11-15-2012, 09:42 PM
jay_bob's Avatar
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Join Date: Oct 2011
Location: Columbia, SC
Posts: 3,639
That is an electronic speedo. There are a couple odd years and models where the speedo was electronic even back in the 80s.
The OM 642/722.9 powered family
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)
2008 ML320 CDI (Older sonís DD)
2008 E320 Bluetec (Younger son's DD)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech
gone but living on
1983 240D (body to greazzer, engine to t walgamuth)
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Old 11-15-2012, 10:43 PM
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Join Date: Dec 2009
Location: Northwest Ohio
Posts: 605
That looks exactly like the cluster on my '81 300TD. That was the only year they used the electronic speedometer on the U.S. spec wagon with the 722.303 transmission. Same as was used on the SDs of that period.

You can actually read the date stamped on the back of the speedo.

1981 300TD 310k miles
1970 280sel 172k miles
1966 230 Fintail 162k miles

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