Hold on. The price I quoted was ~$200 for EACH sensor. That puts the sensors and connectors, plus shipping from somewhere in Europe up around $450-$500. The whole kit is $550, so the tune and instructions are only another FIFTY dollars. Now, if the sensors can be obtained for less money (a high probability) in the future, then one has to decide how they want to deal with it. Remember, if you buy the GMPP tune, and only use the PARTS and install someones tune, the GMPP tune is still out there to be installed. Personally, I am waiting for Lyndon to get the sensors from Europe and the GMPP tune I snagged for him and see what magic he can perform with a little time.
In the meanwhile, I have to get a spare laptop cleaned up for HP Tuner software.