HUD's make it so you don't have to glance down and look at your speedometer while you're driving.
Correct me if I'm wrong, but I'm assuming that the HUD gets it's speed reading from the OBD, so it isn't prone to speedometer error?
\'94 Cobra #4963/5009, black on black, not quite stock
Formerly owned a black '00 SVT, #1972
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RIP - Ray "Old Fart Emeritus" McNairy