That's what I thought. It's actually a circuit, not simple momentary switches.
My guess (without seeing the PCB) is that those two wires are either normally open, or normally closed. Now, when you push a button, it throws that resistor inline, the ECU goes "Ok, is that.. uh... 2700k Ohms? Yep, Ok, Cancel Cruise Control. However, this is a guess, I can't see the traces to tell what it's really doing. For all I know there could be more or less going on (It could stack the resistors or who knows what).
Here's how you can tell which resistors you have:
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1988 Mk3 Turbo Targa - 17.5psi, 486hp, 494tq.
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Who came up with this 500px wide BS?