I will run Aem wide band with Evo scan to log a/r. I know what to do with (BLUE) wire and db9 connector, I hooked up RED to power BLACK to ground, what about WHITE wire? Should i leave it off? or white one is to power up the display on AEM gauge?

 

Did yours come with a manual?

WHITE <Analog Output>
Connects to any auxiliary unit that accepts a 0-5 volt input.

BLUE <Serial Output>
Connects to a RS-232 com port for hyper-terminal data logging.

BLACK <Ground>
Connect to a clean power ground.

RED <Power>
Connect to a switched 10-18 volt power source utilizing a 5A fuse.

Analog Output
The White wire is a 0-5v analog output. This will output the same voltage as is input to the gauge on the Orange wire.
Serial Output
The serial output can be used for data logging when an EFI system is not accessible. To run the data stream, a RS-232 (DB-9) Female Receptacle shall be purchased.


http://www.bmotorsports.com/download...ego-gauges.pdf

 

cool! thanks !!