Nothing crazy special. The JDM HUD cluster used a 9000 rpm tachometer. Basically you can buy a JDM HUD S13 cluster (Make sure you get the correct one for your setup because the SR & CA use different tach signals) and swap the cluster in the car, but it will only read in kmh and so I swapped just the tach over to my USDM cluster. You can also use a tach out of a non-HUD cluster but it has to trimmed and looks cheesy. Thanks
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