not knowing the answer, I would approach it like this. I would get out my voltmeter and find out if it is contact closure or changing resistance by measuring the switch with no wires connected. if its contact closure you can simply connect or leave apart the tow wires. if its a changing resistance, you can pull the switch and get the right resistor at a place like radio shack and connect it between the wires.
I assume you are eliminating the switch in favor of something else in that spot?