I own a AEM UEGO. Installed it maybe a 400miles ago.

When cruising with a part throttle the gauge bounces from 14.0 to 15.3. My tuner said it should lock into one or two differant values at constant throttle.

At WOT it only varies from 12.8 to 13. and 14.7ish when idleing.

 

sounds like you have a good closed loop tune in your car (or your car is completely stock)
nothing to worry about

do some research on "closed loop' to learn why it is bouncing at cruise

 

on closed loop ecu tries to get 14.7 at part throttle, reading from the o2. thats why it varies from 14-15.

 

i'm a big noob

 

Yeah thats normal. mine does the same thing.