Just wondering how you had to wire it to the pigtail. I ran my white cable to the white on the EIO and the logger read 12.65 all the time. I then connected the ground on the EIO to a ground on the car. It still reads 12.65 all the time.
What am i missing? The PLX device has it own 12v/Ground for the unit and a wideband output (white) narrowband output (gray)