I have four brass N scale engines that years ago I re-motored with Kato motors. The are good runners and I would like to install decoders, but never done anything but drop-in, don't have a clue. My only experience, a bad one, was having a Tsunami installed in a Challenger by a Arizona decoder dealer. This took over six months and the engine is a static display because it has never run since. The dealer took the money and refuses to fix the problem(s). So I am a little snake bit. The engines are Hallmark's, a tunnel motor, an SD50, and an SD45. As I said, all have Kato motors. Any help and direction would be greatly appreciated,
