Converting a manual brake switch to a brake pressure switch wiring

This is on a 1963 Plymouth Belvedere station wagon has anyone ever converted your manual brake switch under the dash to a two prong pressure brake switch that gets pluumbed into the brake system. There was originally three wires that connected to the manual brake switch two wires were tied together in one connector that plug into the manual brake switch and then there was one lead off the back of it I'm asduming it went to power cannot figure out how to rewire to the two prong pressure brake switch see pictures of manual and Brake pressure switch