phils C5 vette

If you need credits, JWM is the best

Gen1lightning

Can someone explain to me what the credits are for? Is it for being able to connect to more than one car, or is it for everytime I make a change? What is the deal. Thanks in advance for any info on that. Also what is the difference between Pro and Std? If I bought one of these I would still take it to have it tuned on a dyno, would they require one or the other? I have tried to do some research but I keep finding the Pro and the Std described the same and no additional info on the Credits. Please explain it to the Noob!!! :-)