I have an AEM gauge 30-0300 I have connected the white wire to the pin 55 and the brown to ground when I look at the scanner shows 0 volts on the EGR and 7.31 on the chart I checked the wire on the computer and it showing 4.5 volts and checked the white wire on the gauge shows 4.5 volts. Gauge shows 14.5 at idle. Is the white wire from the gauge supposed to show different voltage? or is it something I am missing on the tune. Thanks in advance for the help.