I drove a 13 mile route (according to the odometer on my Tacoma) and my odometer said 8 miles. According to my math, that’s too low by 38%. Since I now have a machinist who can inexpensively take one of those plastic gears and press it onto my shaft, I would rather do that than pay $150 for a ratio adapter. So I’m back to my question: if the current gear has 18 teeth, how many teeth do I need to correct the 38% I’m off?
