I posted the number on page 3 of this post http://www.turbobuick.com/forums/index.php?threads/411418/
If you are using the SD2 chip with the flex fuel option you need to connect it to the factory maf plug which supplies the power, ground, and signal wires.
I thought I remembered you were. I got a maf pigtail from Casper's and got a flex fuel pigtail from gm and connected them with about 15 ft of wire. I have my sensor above the rear axle between the two hard lines that connect there. I used the info Eric had posted on the SD2 flex fuel post to connect mine.