First of all let me thank you for the great app, and the work and effort you're putting into it.
I noticed some discrepancies in GM TAP Cell readings between CGP and TECH2. All positive pressure readings are correct, but all negative pressures are offset by 63.75 PSI I attached a comparison table showing readings from CGP and TECH2 for 2 different cars (both LS1 engines with 4L60 transmissions).
One last note, readings should have 2 digits after the decimal point, as pressure adjustments are made in 0.25 PSI increments.
Samer Nabbout. Mechatronics Engineer. Cars: 2002 Chevrolet Lumina SS, 2006 Infiniti FX35, 2011 KIA Cerato.