Believe that model SHOULD have the electronic speedo. My connectors clamp in without the screw type connector for the manual/mechanical.

Also, when the speedo was converted when the car was brought into the CONUS they put a gear in it that caused mine to register about 10% fast. I had to get it rebuilt by a guy down in Ft Lauderdale and he changed out the gear(s) during the repair and it now registers both speed and mileage as it should.

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Don
'85 500SL (Euro) - 186,000 w/a complete restoration and engine rebuild at 154,000
'95 C280 - 174,000