73 duster electrical

Welcome aboard Pat, For the N safety switch, it's in the trans and shouldn't be an issue (or even unplugged) with just the shifter swap.... unless the shifter isn't moving the lever all of the way into park. You could try jiggling the shifter or disconnecting it from the trans and manually shifting the lever into park and checking the sender with a volt meter. Do your reverse lights work?

The "charging system does not work" issue is a world all it's own.
Is it not charging at all? low voltage? overcharging?
What was the "need" to change all of the parts out at once? or was it a new install?