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Thanks for the responses. When my wife is screaming slow down I tell her I am only going (Hud speed) when my buddies in the car I say wow can you believe we got up to (guage read-out).
Mine is pretty accurate but remember that the HUD number is rounded to an even number, though I'm not sure how it is rounded. I imagine that could account for up to a mile's difference. But 3-4 mph seems like a lot.
My HUD is 1 mph lower than the speedometer. I'm not sure which is correct, but tend to think the digital HUD should be more accurate than the analog gauge.