Placing a tach in a 90 accord. Have all the other wires figured out . (Ground ,illumination ,power) need help finding the RPM signal wire. What colour wire in the wiring harness? Please help.

 

basically you're going to wanna trace back the RPM trigger from the igniter.. i dont remember which color it is. it goes back to the ECU (it uses it for fuel map).. i'll look in my electrical manual tonight and see if it lists a color. if i remember right its the middle wire on the igniter but dont quote me on that till i look at the book. I had to tap into mine for my Crane HI-6 ignition, but that was 4 years ago.

 

blue wire from side of igniter,it is the one that is down from the rest.

 

you sir are: CORRECT ding ding ding!!!

looked in the book and 'engine speed output' is listed as BLU.