I just did my first conversion and what a delight. I converted an AM FP-7 with ERR's cruise lite and railsounds boards, but I did it the easy way by purchasing a dummy B unit too and tethering it to the A. I had Ron leave the regular B trucks in so I could get power and common from them to the cruise lite board. So I was just tethering from the B to the motor and headlights in The A.
Since I had an empty B, I was able to use ERR's speaker with just a little bit of filing the baffle/mounting to get it to fit. I also added LED headlights, tail light, and a strobe all controlled by the board.
I am giving it to my son tonight as a present along with some Budd coaches and a brand new vista dome.
I am only a few months into modeling, so you pros out there could easily handle it. I made a number of mistakes along the way, but I had great help from Ken at ERR, Ed Goldin, Carl Tuveson and Ray who corrected and prevented some. For example, I would have bought the AC version of the FP7 had I not spoken to Carl and learned that the cruise lite only outputs DC.
