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did you seat the cable end far enough in at the tranny and is the little collar in place? don't forget the hard washer that drops into the tranny before the cable goes in.
I think bouncy=binding.It did on mine.I would check for smooth routing and well lubed.Brent
I'm with Guzzistajohn and ncdan: Fitted a Speedhut GPS speedo to my V50 II and haven't looked back. No cables, no wheel sensors, no geared cable take-offs, no mechanical interfaces, no readouts off-target by a percentage. Only requires one small antenna that can be mounted anywhere you wish. Lightweight, simple, and unerringly accurate with both speed and distance. A real step forward.