I have a stock 6.5 installed in 96 3500hd and looking to keep it that way. I recently replaced the injector pump and accuired the GM Tech 2 to get it in time. The truck starts very well and sounds good, pulls a trailer with a load ok but seems to lack power. When using the Tech 2 I noticed the boost pressure reads 14 psi at idle of 700 rpm, then when under load advances from 14 to 26psi. I have an axuillary boost gauge installed that reads at idle 0psi and advances to around 15psi under lload. Thinking I had a bad boost sensor on the intake, I replaced it only to have the same results, 14psi at idle. I'm guessing that if the ECM thinks it has more Boost than it actually has, it will limit power. The Tech 2 tool has a manual operate test to operate the wastegate valve, and it is working properly. Is there a way to calibrate the actual boost pressure or could somthing else be causing the erronous boost pressure reading?