The cable end slides into the back of the cluster as you know, possibly you havent put it back in properly or its damaged and its slipping/spinning when it spins at a certain rpm.
Doubtful that you kinked the cable, if you simply took it out and put the cluster back in.
Does the speedo jump around when it gets to 40k's when it rattles does it keep rattling above 40k's, does it jump around below 40k's?.
On another note you can convert cable to electronic, if you really want the sr5 cluster that bad.
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