I have both the Quadzilla XZT+ and Recon gage installed on my 2002 Dodge Ram 2500 5.9 L Cummins and am a bit confused about which wire to tap into for the boost reading. I've tapped the middle wire (black) coming from the connector plug from the MAP sensor but am getting a zero reading when I know there's boost happening. I'm reluctent to tap any others until I get the correct information. The instructions are a tad ambiguious when one has a power module installed. Help anyone?

Thanks.