After Market Universal Wiring Harness & Fuse Block?

I used the Ron Francis Express Kit when I rewired my 64 Dart Wagon. This is a great kit with easy to follow instructions.

I’m looking at using the Ron Francis kit for my ‘64 Dart 270. Did you keep the stock gauges and ignition? What modifications did you have to make to accommodate the new harness? It seems that the kit is everything from bumper to bumper, so did you have to remove the connector that bridges the factory engine harness to the underdash harness? Thanks for any help, just trying to figure out what I’m getting myself into