I have the 1838. was originally a single axle but is now a double.
I managed to get it to work. had to extend one set of wires and had to relocate the back up beeper closer so the wires would reach.
The MFU sits in the cab differently then the light kit. The level where the cab tilted up holder is, the far left on that picture is where the block sits for the light kit.
you can see it in this picture when i had it all apart. it is just up and to the right of the motor in the picture.
