APC Automatic Powertrain Control. It has a charge protect, rpm control for PTO and with out PTO. Has a digital read out of rpm and different ramp rates for rpm. Best of all it makes the Dodge guys say HAY WHAT IS THAT????? How come my dodge doesn’t have one of them?
you can set up many different ways to come on my dad had it set to were he just bumped the e-brake and the rmp would ramp up to 1200. Works great for the air-conditioned and when it is cold out.
The little thing in the air box is for the computer to pick up out side air temp.

The little thing in the air box is for the computer to pick up out side air temp.