Stop in for a cup of coffee

There is a sensor under the driver seat. No idea if its hooked.to buzzer or interlock or just a light, all the wiring appears to be there tho. I'll find our eventually..
Ok, just curious...If its just driver and a wire in driver belt, that is similar to my late '75. 74 was a mess... Had a lot of switches Im just interested in when they started and stopped some of the safety and emmisions stuff. I want to try to figure out dates they made some of the changes...