I didn't add a Current Keeper, just the capacitor that came with the ECO-100. It's tight in there, but you might find room. I ran 863 on two trains this morning and love the GE sound.
I added two to 863. The template that comes with PL-130 is slightly off for drilling the two holes. Use your divider instead.
Some photos of HO 863 working on the Knoxville club's HO layout plus Bob Plough's prototype photo in Springfield.