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#1
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1985 300sd speedometer swap
Hello all. I have a 1985 300sd and I want to replace my mph speedometer with a km speedometer. Can it just be swapped out with any W126 unit? Thanks.
Mike |
#2
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Not exactly, it has to be matched to the differential gearing. IIRC, the 300SD was only sold U.S.
I've been doing some research on this and I believe the differences are on the interface board which the electrical connection is made and then to the "mechanical" portion. Having changed the differential on mine, I need to find out the component differences between a 420SEL and 300SD interface board. |
#3
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I think 126 300SDs were also sold in Canada.
One option might be to replace the speedo mph faceplate with a km/h faceplate. Any 126 faceplate with the same range should work. You might be able to customize a 123 or 201 faceplate with the same range. Edit - the odometer will still be in miles. Sixto 98 E320s sedan and wagon |
#4
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Your speedo is specific to your differential (2.88) which was a one year only (1985) so you need a speedo out of another 1985 model.
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#5
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There probably is a very simple fix for this. It's likely to only be a couple of components on the circuit board that change this and if you could take a good detail photo of the circuit board, we likely can come up with something. Maybe James Dean has some information.
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Sam 84 300SD 350K+ miles ( Blue Belle ) |
#6
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Quote:
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1983 123.133 California - GreaseCar Veg System |
#7
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Sorry, I was referring to w123's with mechanical speedo.
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