Ok, we're wiring up a Auto Meter tachometer to my Civic hatch with ITR swap. There is a wire on the back of the tach that needs to be wired up to either the ECU or distributor. The problem is, i don't know which wire on the ITR distributor harness i need to patch into to get my RPM signal for the tachometer. Can anyone tell me which wire it is? TIA.

 

Blue wire from the distributor, its off the connector that only has two wires at the back (closer to firewall) of the distributor

 

you can also look near the driverside firewall, theres a rubber plug. has a test connection under the plug. the blue wire there is also a tach signal. tap into it. easiest way.