In this video I convert a classic truck or car cigarette lighter into a kill switch for the coil ignition wire. The on/off switch could be used for any of the electronic devices on an old car or truck.
I talk slow. If you play the video at 1.25 speed, I sound less boring.

CIGARETTE LIGHTER: $21.95
classicparts.com/1947-53-Cigarette-Lighter-Assembly-12v/productinfo/36-508/

PUSH BUTTONS: $15.98 12V 5amps
amazon.com/dp/B08P4HKCVX?psc=1&ref=ppx_yo2ov_dt_b_product_details

FAUCET WASHER: 9/16" beveled rubber faucet washer - - - any hardware store