I am a newbie and have only had my truck for about a week and a half, but I have noticed that the speedometer and the bullydog read different speeds. I thought the programmer would correct the speedo and yet it always reads LOWER than the speedo and i have 305's on the truck. I havent yet read up on the BD yet so I am certainly not sure whats going on. Just thought i would try to get some advice from people on here.

Thanks in advance for any help