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I personally can't help you with this but thought I would let you know there is a speedo shop here in Independence MO that is owned by a guy that is into old Chryslers. He has them all over his lot and since he is in the repair business might be able to help you with some instruction. PM me if you are interested and I'll get you their number. I run an automotive shop here in KC and we have used him several times on various repairs and he has always done a great job for us and was VERY knowledgeable.
I had this guy do work on the speedo and tach in my Chally... http://speedometersolutions.com/ Granted he was "local" for me but he was quick (maybe I got in at a slack time?) and I've had no issues since. Did this maybe 5 years ago....