Adjustable switch connected to ecu, pin 85???

[mossimo500]

I was wiring up my boost gauge light and found a switch attached to the ecu. It is going into pin 85 and the switch is adjustable. Pin 85 is barometric pressure sensor right? Why would this switch be there? I adjusted it when I found it ( didn't realize it went to the ecu at first) so I don't know if I messed something up. The car runs fine if the switch is turned all the way left or right but if you turn it towards the middle the idle starts to drop and the car will die if the switch is directly in the middle. Anyone know what this is for?

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[turbosax2]

It's to prevent a CEL caused by the 1g cas. See page 10 for a detailed explanation:
http://www.magnusmotorsports.com/tech/1gina2g.pdf

 

[mossimo500]

Thanks!