I have a 04' 350z I have a secondary Tachometer and i want to splice into the current tachometer on the main gauge cluster. The (M19) plug in the back of the cluster would be easiest to splice, does anyone know the color wire im hunting? or if there is a easier way to splice into the rpm gauge? Thanks!

 

There is no tachometer line into the instrument cluster. The tachometer signal is sent from the Unified Meter and A/C Amp (the unit behind the air conditioning controls) to the instrument cluster via a data bus.