A/C thermal switch hook up?

[N2TRUX]

I had to replace the Thermal switch on my 77 a/c system. This is the little control box that goes next to the dryer canister and hooks to the pressure switch.
I got everything hooked up but the two wires that feed it. Since this switch is totally different from the old one, and there is no markings I have no idea which wire go where.

Since the switch was 28.00 bucks, I don't want to fry it. Does anyone have a diagram of this switch? I have searched the net, and this site but can't find what I need.