20-03-2022, 05:49 PM
Ivor, my car also has a Magmo speedometer which is seriously pessemistic. At an indicated 25mph, the car is doing almost 30 and the discrepancy between indicated speed and actual speed gets worse the faster the car goes. Any more that 35mph and I start to get those flashing '40' warning signs and an indicated 40mph is a true speed of 48!