need I2 help for 2013 dodge ram 1500 3.6

[stiffmyster]

Hi,

Hopefully I'm posting this in the right place, if not, sorry,
I just bought a I2 for my 2013 dodge ram 1500 3.6, I just want to get a bit more horse power, torque and better millage, now I'v put the mpg booster and it's not working so good, it's screwing up my speedometer.
I've done a advanced tune and it was ok, I put in a cold air intake, changed my exhaust system from CAT back and I really haven't noticed any difference once I put this I2 on, can someone help me on this please???
I"m by far not a car junkie...