JG1966
Well-Known Member
My 150 mph rallye speedometer in 72 RR is reading way too low. Says I'm doing 20 MPH when I'm doing about 50 (hello officer). Based on tire size (295 50 15) and 3.91 gears, I need a 38 tooth gear. I pulled gear and it's an orange 40 tooth gear (part number 52068062). So I'm close to the right gear. What else would cause such a wildly inaccurate speedo? If it matters, the rallye dash is not original to the car and the speedometer "hand" sits well below 0 (straight down at '6 oclock') when car is off. Thanks for any help.