Hi silver
this is the safety switch for the clutch pedal of the boxster. there are other generic switches just like it, for less $ (i just don't know how its called in English).
the nice thing about this type of switch (on top of the fact it is very robust), is the ability to bend the lever, and get much accurate setting.
not only that, if you would like to activate the switch using the pedal, it will not break if the pedal has more travel after touching the switch. the switch lever will flex like a leaf spring, and will return to its initial position once released.
problem is, it will be activated every time you will press the brake to the set level.
if you want to do it the right way, i have an accelerometer sensor, that can detect deceleration, and can be configured in 0.5G increments. it also has internal timer to adjust the output length (to hold a relay).
just like Tony, i'm not sure if the spoiler will operate the way you want it. it extract really slow, and by the time it will be all the way out, you will be probably stopped already.
as for the second part of your post.
the switch that manually activate the spoiler, is not a one touch switch.
you have to press and hold it, until it complete its travel (both ways). you can even leave the spoiler half way open, if you want.
looking again at the diagram, i can see that on top of the two relays (that looks like generic 5 legs) there are 5 wires going to the spoiler motor as well (can you confirm ?).
YES THERE ARE 5 PINS
so... there is another circuit on the motor itself. could be i have a faulty motor.
i'm sure ill be able to find the issue once ill dive in to it (this is the first time i even look at the diagram).
worst case i'll ask Tony to build me a circuit the connects to the VSS and activate the relays.