I have never used the 3 bar sensor - only the stock 2.5 and 4 bar (with baro, which I am currently using).I will have to queue up a load gauge, as I only use a MAP gauge, along with two digital readouts for vac & boost in TunerStudios.For shits & giggles, have you tried loading up TunerStudios and seeing if the same discrepancy exists?
---2012 2500HD LML