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Yes, Check the resistance of the coil on the back of the speedo.
If its around 1K then it OK.
Cruise faults are generally the controller or 'amplifier' --as people round here call it....
--This device suffers from a few maladies, mostly dry-soldered joints on the board, sometimes the tiny reed-relay develops a high resistance leak as well as the set-speed cap and the FET. The FET's however are no-longer available, they are a two-gated P channel device....
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http://i190.photobucket.com/albums/z...0TDnoplate.jpg
Alastair AKA H.C.II South Wales, U.K. based member
W123, 1985 300TD Wagon, 256K,
-Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog. 
W114, 1975 280E Custard Yellow,
-Great above decks needs chassis welding--Really will do it this year.... 
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