r134a conversion pressure switch wiring

[e30_3I8I]

I have an 89 325i. Just finishing up the r134a conversion on my car and have some questions about the pressure switch wiring. Tried searching for a clearly explained answer to what needs to be done with the wiring, but didn't find anything. Can anyone explain what needs to be done?

The new Pressure switch has 2 wires, both are black with red stripe.
Now I have 3 wires in total that need to connect to the switch. 1 black wire, then 2 wires, both black with red stripes.

Question: Which wires get connected to the pressure switch? And does the orientation of the wires matter? Both the wires from the pressure switch are identical in color which gives me the idea that it shouldn't matter. Thanks in advance for the help!

Here is a picture of the wires:
[IMG]file:///D:/My%20Documents/Downloads/20160821_121634.jpg[/IMG]

[Das Delfin]

I feel like there is a service bulletin that explains this and it's been posted recently

but.. polarity doesn't matter. Essentially you are replacing two switches with one. So you need to short the wiring for one of the old switches and put the new switch in place of the other

found it.. http://www.exx.se/techinfo/docs/r134a_retrofit.pdf