which wire did you run it to on the ecu? i hooked the purple wire of the gauge to the white wire with black stripes on the upper ecu harness, then the red wire to positive switched and of course black to ground. i'm getting no signal at all. no lights no anything. i put a fuse in the power line like the instructions said? should i take the fuse out? what can it be?

is there any way to test the gauge without the o2 sensor hooked up so maybe i can tell if it's the gauge and not the wiring?