The sensor I have used replaces the speedo cable which fits into the gear box which then coverts to pulses for the speedo so there is no air gap tell me if I am wrong but following the per said intrusions on which colour goes where 3 wires from sensor red ,black,white colours from speedo red ,black,white,blue,yellow,green now they say I do not need to connect the white from speedo has done away with the Hall effect which you only use the white for the red goes to perm live black to ground green to white on sensor blue to switch live yellow to side lights done all that but surely when you turn on the ignition the dial should a least show up all o in the miles and trip counter which it don't so it's either they have a bad batch of dials or I am going wrong some where I just can't think where
Unless I try running a new wire from the battery both live and ground just to see if there is anything