Anybody know what could be wrong? With the Diablo tune I can adjust the speedo for the 4.10's but with the factory hp tune I can't.

 

How old is the tuner? I`ve heard you cant adjust the speedo with the older predator unless you install the performance tune. Mine I bought brand new about 1 month ago and it will let me adjust the speedo without installing the performance tune. [&:]

 

What is the version code on the tuner.

That was a common issue with the "C" series tune and should be fixed with the "D" series tune. You can DL for free from Diablo site you will just need a null modem cable and a power source for the predator to do it. They tell you everything you need on Diablo's site.