if you can bury a 220 spedo that is accurately then stopping for the cops is optional(though the other option might containt a plastic baggy with whats left of you)
I installed a 220 mph speedometer face from Blue Gauges a few years ago. I bought a Yellow Box to recalibrate the speed and, using our local constabulary's rent-a-roadside-radar unit, I did several passes, recalibrating as I got closer to the unit's displayed speed, until I got it completely accurate.
NOTE: the speed recalibration is achieved at the expense of the odometer and fuel mileage calculator, which now read lower than actual. Don't ask me why....I can't explain it.......makes head hurt too much.
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