Exactly what I was wondering, was it just the sensor the whole time?! Figured an electrical guru such as yourself would've troubleshot all of that before buying hard parts!
Well, got a new sensor from Cummins in OKC. Keep this in mind if you need one.
Dealership price $701 Dodge P/N 68002442AA (called multiple, all the same)
Cummins parts/service center $192 OEM P/N 4928594 (if they have one in stock, I don't think they can order them now)
Doorman aftermarket from Oreilly's $122 (if you want to chance aftermarket ****)
Test drive tonight. I can't wait. I noticed the turbo was only making 20 psi boost while hauling hay this weekend as well. Maybe that will change too.