I have an Apexi Auto Turbo Timer. I also have the Blitz harness for it. Simple enough to run it from the ignition harness and vampire tap into the e-brake ground. However, the instructions call for wiring into the O2 sensor and ECU ground (might as well have the auto-calculation of time). Where do I find said O2 sensor and ground wires near the ECU? instructions included only show Lancer using 4G63 motor. TIA!

(I also posted this in How-To but I don't know if it has as much (or as knowledgeable) traffic as this part of the forum)