some msd/o2 sensor experience needed

I noticed the instructions said it will read lean at idle with a lot of overlap ? I have around 260 @.50 overlap and around 535 lift. Right now as i read through the instructions for tomorrow , i noticed I can't hook the power up to anything basically that runs anything else ? One long wire (another one !) Through the firewall to the battery in the back ?
Thank you all again.....

Hum... I'd think it'd read rich at idle with a lot of overlap cause you usually have to run it rich with a lot of overlap, but I don't know that unit so I can't say positively. I have mine wired to a main B+ block I installed to power all the peripherals and don't have any problems, but it's not the same unit as you have either. I imagine their worried about noise generated by something else affecting it. Generally a good capacitor like the kind you use with high power stereo's will kill the noise