[lkchris]

I believe he's actually writing about changing the whole cluster.

Some folks would call a speedometer a clock and maybe even a tachometer a clock.

In all the articles I've read about installing a 996 cluster, there hasn't been mention of a problem and surely they read to a higher speed than the 150 mph boxster.

It's surely the same digital input from wherever the speed sensor is and the cluster computes what it needs from that. It's not a mechanical cable.