i have 04 wrx wagon the gauge i bought is a single wire 0-1v gauge that goes to sensor signal wire on all the ecu pinout diagrams ive found its shows the signal wire should have 0-1v. when i backprobe the signal wire on my ecu i have somewhere between 8-10v fluctuating which should represent waveform pattern and gauge doesnt work. i also noticed the sticker on my ecu says 12v. why are do my ecu pinouts not represent the same voltages in the diagram?