This is a popular anti theft switch that we often wire into customer cars in the passenger foot well. People often wonder how to protect a car with no door locks and this part is a nice device to help protect your precious Sprite.
We locate it adjacent to the starter solenoid with the key passing into the foot well, above your passengers thigh. You can turn off the juice when you park and take the key! You'll need to run new battery cables from the battery to the switch and from the switch back to the solenoid.