how do i go about hooking up a tachometer to a distributorless system? the car has a crank sensor of course and i cam position sensor...i dont know if that matters. im reading something about hooking one of the wires to the negative terminal on the coil. how do i find the negative terminal? i know u guys are experts so this is the first place i came to for help. i dont care if i sound like a dimwit either


thanks!!

 

what car is it for? most cars have a "tach out" wire.

 

most cars have a "tach signal" wire coming from either the ignition system, or the PCM...

 

there is an "engine speed signal" wire that comes out of pin #42 on the PCM connector. could this be a satisfactory place to hook up the tach signal wire too? will an engine speed speed signal from a PCM send too many pulses?

it is for an OBDII equipped 4 cylinder car with a dual coil pack system.

 

hook it up and see what happens. you must have a diagram right? if thats all it says i would guess thats the right one.