Mine reads five over. At all ranges. Same 5 over. Except stopped, where it reads 0. Odometer is spot on. Doesn't bother me much, but I did have to explain to my mother in law that I really wasn't speeding THAT much.

My 123 reads 5 over also. My first 123 did also but my 126 is dead on (gps verified)

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1981 300SD 512k OM603