After 1995, the 850's have a different door locking system that not only includes the dash switch, but also a two-stage function that allows the driver's door and only the driver's door to be opened; the next stage opens all doors. In addition, the wireless remote system changed after 1995 (got smaller, better).
To do what you are asking will, at a minimum, require a wiring diagram. You may be able to tap into the right circuits, but you will have to be careful about the alarm function.
Why do you want this switch? Since the 1995 does not have the two-stage function, how will a switch perform differently than simply using the door lock?
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