If you look here on figure 3, E-8, it has the blue/orange AC wire, and the green/red that turns into a light green/black wire after the switch. How do I wire the switch into the AC system, or is it needed? I will be using an OEM pressure sensor off the high side of the 1999 donor car.

http://www.madracki.com/miata/images/wiring/90diag.pdf

Any idea's? I like the idea of the sensor being in place to keep the Evap from freezing up. Also, what about an orifice tube? I think the Miata has an expansion tube or something, but am unsure...... AC is greek to me!

Thanks all!