Should have been more specific - it's an electric speedometer (my 300D of the same vintage has a mechanical one). Will check the connections. Just hoping there was (is) some sure fire way to determine which end is bad without shooting in the dark. Thanks for the advice.

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John Schroader
bio burnin' 83 300D, '83 300 SD, '79 240D
"I've never met a man who was good at making excuses who was good at anything else" Ben Franklin
"You cannot permanently help a man by doing for him what he could and should do for himself" Abraham Lincoln