My son's mother took him to a train show where he convinced her to buy a used Spectrum PRR K4 (5404). From what I've found out online, this engine was released in 1994. I took the shell off the locomotive, and discovered that the rear pickup leads are not connected. The tender is hollow. Would it make sense to install a DCC socket on this loco, with the wire leading out to the tender where I can install the decoder? I've never done any of this without a quick plug, but I've soldered computers together. Any hints or tips?