Originally Posted by b16aEGcivic
actually you can just use the blue wire that already goes to the back of your gauge cluster as it is the signal wire for the tach because all civics come pre wired for a tach. :thumbup:
Or if you want to know what the ECU pin is for the RPM sensor, check the civic page in my sig for a 5g wiring diagram. The center of that chart is the ECU pinout.