Swapping gears from a 3.42 to 4.10 in my 95 Z28. I have already purchased the cable and that came with a free copy of tunerpro. I am completely new to this stuff and to be honest reading some of these posts give me a headache . I have no clue what BLMs or BINs are. So if anyone could tell me how to calibrate my speedo and can explain it to me like im a 7 year old that would be awesome!!