Can someone tell me where the coil negative terminal is? I am trying to install a MSD Digital RPM Window Switch to turn my zex system on/off, pictures would be great, or just tell me what wire the negative one is. Or if you know which wire on the computer i can splice into to get a Tachometer signal?

 

on the large distributor plug the rpm signal is the solid blue wire..sometimes its kind of an aqua color....i dont remmebr which wire it is off the ecu get a diagram off the apexi web site for a vafc ..

 

thanks