In 1955, the car alarm was push button switch under driver's seat connected to the car horn (the lamp in simulator). Weight on seat blows the car horn. The hidden SPST turns ON or OFF the alarm system.
As hard as new cars are getting into and out of - this might be as good system as newer alarms and what car jacker wants to drive a car with the horn on all the time? If you expect a car jack - switch alarm on and run when you are pulled out of your car.
