Just purchased a TST for my truck, but discovered that it is not compatible, or at least not to all of them, some work, some not - heard also about a switch change that might cure the imcompatibility.
Any experiecnes out there ?

 

it has to do with some different programming DC has put on the ECM's.

Dont worry though, TST and all the other aftermarket guys will get this figured out soon enough and I'm sure they will send you exactly what you need at no charge.