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Classic symptoms common to most C2's - there are many suppliers who specialize in proper rebuild of the odometer gear train; Corvette Specialties of Maryland has done several for me, and there are several Forum members (like Jason) who also do this work.
From: Putnam Valley, New York. Amateur Radio Operator K2NS
Speedo
Bouncing or pulsating speedos are usually caused by a speedo cable that needs to be lubricated.
The odometer in my 67 has not worked since the day I got it in August 1974. The odometer gears on most 63-67 corvettes stripped out after a few short years. There are a bunch of Corvette vendors who rebuild them.
glad you liked Rick's work - please spread the word
FYI - picked up my instrument panel on Saturday - he restored my speedometer and tachometer, adjusted the ammeter, temp gauge and repainted the body - all for $300.00!