What is this?

Is this a real thing?!? I’ve never heard of such a thing!!!!!
Absolutely. It was a "one year only" federal mandated deal. My Gramps had a brand new Dart, nobody knew what to do with them back then. The Dealers finally started unhooking the seat switches under the seat. People raised hell about this. You can imagine, "one of the kids" causes the thing to trip and then if the car stalls in traffic....................

The irony is that I myself now own one. It recently went to 'body shop hell' for roof repair. It's a 74 Scamp. Someone just stripped the wires at the connector and twisted the harness a couple turns and plugged it back in