Originally Posted by Burgundymog
Originally Posted by John V6
My Roadster under reads by 10% but MMC says it is legal. Another feature! I fitted a GPS speedo off fleabay as belt and braces


MMC is wrong, all manufacturers are required to fit speedometers that do not under read that is why most over read by 10% it is to protect your licence. It is possible to re-calibrate your electronic speedo using the reset button I think there was a post on here once.


It may be possible to re-calibrate a 4 wheel Morgan using the reset button but you need to find the black / black and grey wire or link into the plug on the back of the speedo to enter the calibrate mode with a M3W.