Good plan: there is massive parallax error between the speedo needle, markings and the drivers eyes.

I know that what looks like 80 on the speedo is, from the GPS about 75, but above that speed I need a co-pilot to record both GPS and dial data!

Sounds like a great excuse for a run out!


Peter,
66, 2016 Porsche Boxster S
No longer driving Tarka, the 2014 Plus 8...