Neutral safety switch or something else?

Check the NSS on the trans to be sure it is snug. Also check for oil in and around the terminal.

I have heard of people slightly tightening the NSS and its function coming back

If it has not been changed it should only have 1 post for the NSS wire that leads up to the Starter relay. 67Dart273 has great trouble shooting advice for you

Bob67Barracuda said

I always figured there was a switch in the floor console but apparently not.

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there is a switch in the floor console but it is for backup lights only