Originally Posted by SpartanDieselTech
Absolute EBP is the one you want to monitor.
From the list you've mentioned here, it seems that you have the bases covered
What he said ^^^^
I believe that the exact gauge name is Exhaust Pressure (absolute). It monitors exhaust back pressure + barometric pressure. The best way to figure out what number to subtract from the reading you see for EP (absolute) is to turn the key over without cranking the truck and see what EP (absolute) says. Typically it will be between 12-15 depending on elevation. From there you just have to remember to subtract that number from the reading during a drive cycle.
Example: EP reads 14.4 with the key on, engine off. You begin a drive cycle. You see EP hit 68 during the drive cycle. Actual exhaust back pressure is 53.6 psi.
Hopefully this helps!