My hud is about 2 to 3 mph off what the speedometer says. Is this normal? I've checked tire size and all the tires are the correct size. Is there any way to make the speedometer and hud match? :? Also which one is correct the hud or the speedometer? BTW, yes its on mph not kph

Thanks for the great forum! Also, I would like to find some bonneville people in northwest ohio or northeast indiana to hang out with sometime. A good reason to talk about cars and drink some BEER!

normal, hud is the more correct of the two.

ya my grand prix has been that way since i bought it. but its only like 1 maybe 2 mph diff.
but a freind of mine told me to go with the hud over the dash.
btw hud says 75, dash says 73/4. but they both are the same till 25 then agian after like 85 or something.

The gauge is mechanical and subject to inaccuracy where the hud is not.

Mine is further off depending on how it feels that day.

http://www.bonnevilleclub.com/forum/...=486258#486258

Mine is like that too 2-3mph off just check with the hud once and awile wile driving
i don't like the hud on all the time.

miine is really far off, when i'm going low speeds, its not that noticable, but when i'm going 80 on the speedo, it says 87 on the head'* up display

i would have to say that mine is about the same at lower speeds, but it says 64 on the hud and 61 on the speedometer

my speedo is off 4 mph in the higher speeds

My poor speedo suffers occasional whiplash and is off about 5 mph at highway speeds. I'm considering cleaning it next time my cluster is out.