http://www.caperselectronics.com sells an o2 sensor simulator, which i might use for my ECU, which is tripping the rear o2 sensor problem is that the simulator is designed for a 4 wire o2 sensor, nissan only uses 2 wire sensors, which means i need to run a "switch" 12V lead to it.. but where can i get a switch 12V power from underneath the car? can someone help?