I'm sure these easy ways to work stuff out is pretty damn accurate & no calculator or degree in mathematical engineering required I have checked them and the gears ratio saves a major headache indeed (unless you love counting up tiny teeth - 21 22 23 23 - no crap start again 1 2 3)   Count amount of turns on bevel gear to rotate the sector gear 1 full revolution & multiply by 3 checked this against stock, high speed & high torque gears - works out very well