Gladman,

What you have is Spring Air. You 1st photo is correct just set up
the travel so it just pushs the button down (gear up) and completely off of it for gear down.

Photo 2 Spring Air control valve

Photo 3 The smaller one is the SA filler valve and yes it does take
a special fitting although I've had good luck just sticking the air line in and pumping.

I hope the retracts are SA (gold color) as there are not many with
a one line setup.

Check out www.retracts.com for info.
You might look at the misc. items there for photo's and yours is the older control valve. I like the new one better ( easy setup)