I purchased a wiring harness through eurodyne for a new maf and there are 3 wires that need to be soldered. Shown here, The Signal, ground, and 12v

But there are 4 wires on the stock maf, Which are brown, yellow, red/green, and green.

So following a tut i found it
Audi V8 MAF Pin descriptions:

1. Not Connected (NC)
2. 12V
3. Ground (0v)
4. 5v Reference
5. Signal

Audi B5 A4 MAF Harnes Pin Descriptions:
a. Green
b. Red/Green
c. Yellow
d. Brown


http://i106.photobucket.com/albums/m...ess/notes1.jpg


So i'm under the impression you solder both the yellow and brown to the ground,
And the 12v to the red/green,
And the green is the signal.

Does anyone have any experience with installing a v8 maf?
I pulled the info off of Making an Audi V8 MAF Harness for your BAT Project

 

I figured it out, to solve my question.

the 12V power wire connects to the red and green wire on the car,
the ground wire connects to both the yellow and brown wires on the car,
the signal wire connects to the small green wire on the car.