I have it,
It plugs into the wires for the throttle. and then a power wire, then you route the box and wires to the cab and I mounted it on the top of the sttering wheel box (next to flasher) and you have to adjust a dashpot to make 1500 max RPM at the max dial setting and done!
It Work great, If you are jumpstarting someone, it helps to get more juice to the dead battery. If you are idleing more than an hour, it keeps your engine a little warmer and prevents the washing down of cylinders from unburned fuel.