Measured the calibration of the odometer and MPGuino using highway markers - they read ~1.1% low on distance, but perfectly agree with each other. The speedometer itself (original to the car) I judge has a tired spring, as it's pretty much dead on at low speeds, but reads more and more high the faster you go. At 65mph it shows ~4.5mph high, while it's closer to ~2mph high at 35. I might pull the needle off and split the difference.
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