Viper

My S1 was the same. I recalibrated it using a Satnav and then reset speedo so that it now reads just 1% fast.

If you can't find it on the forum, pm me and I'll play with my speedo again to give you the figures and how I did it.

Cheers

Philip

1985 Plus 8 four seater
Malone F1000 - track car