Brake warning lamp problem

[jcd9730]

Trying to get my brake warning light to work correctly. It has never been hooked up, and the PO for whatever reason removed the wiring. There is no wire to attach to the prop. valve, so I don't know where to run the wire from it. I don't think the ignition switch is wired correctly, but I'm not sure how to do it right.

I've been looking at wiring diagrams, but I don't understand where to wire on the switch. I was thinking I could run a new line from the prop. valve to the dash or ignition switch, but I'm not sure how. I'm thinking that the ignition switch is wired incorrectly.

Pics would be very helpful, if possible with the relevant wires pointed out.