I installed my AEM wideband with gauge. Everytime i go wide open the gauge reads around 14.8-15!!! Now i know this isnt right, i had my buddy hook up his laptop with his tuneing software and everything seems ok. The car runs fine as well. Any ideas what would cause this?

 

The AEM sensor is pre-calibrated from AEM. Either faulty sensor or faulty tune, since you have ruled out tune so far im willing to guess its the hardware. Give AEM a ring im sure they can steer you in the right direction.