Universal mechanical motorcycle odometer Ø 60 mm with warning lights K = 1,4 Universal mechanical instrument Ø 60mm. M12 fixing pin. K 1.4. Blue backlight. Complete with n. 3 lights (NEUTRAL / ARROWS / HIGH BEAM). With total and partial km measurement. To check the wheel ratio (K) of your motorcycle proceed as follows: Calculation of K: K = 10 X / U. X = number of turns made by the speedometer cable by turning the wheel 10 times U = wheel circumference. TO BE CONNECTED AS FOLLOWS: BLACK CABLE = - (NEGATIVE) RED CABLE = LIGHTING (+) YELLOW CABLE = ARROWS BLUE CABLE = FRONT LIGHT INDICATOR (+) BLACK CABLE = NEUTRAL (-) GREEN CABLE = NEUTRAL (+) Learn more on the compatibility of mechanical odometers click here