Is there an easy way to diagnose a non-functioning speedo in a 300SD? I've been meaning to replace the gears on my odometer for some time, but recently the speedo did a couple of quick bounces and then died. If the problem is the sending unit, then I will try to replace that and the odo gears. If the speedo itself is dead, then I hope to just replace the whole unit. I'm sure there is a sure fire method to determine what is dead in the speedo ckt, but I'm in the dark. Any suggestions? Thanks in advance.

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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