Across my 3 Mogs the speedos read an array of data: +8 reads approx 6mph above actual speed, the 4/4 reads when it wants too and that is not often, the M3W reads something which I think is altitude it certainly isn't speed.


Bruce
1964 4/4 Series V Comp (Megan)
1994 +8 (Maurice) tis no more
2013 M3W (Olga)