Old School SMC Qeustions

[mtocrs1]

So this car I bought has an old school progressive SMC kit that has a failed pump.
It also has this thing with the wire broken off.
What does it do. I checked resistance and it's a normally open switch.
Also where can I get a new pump?
Worth the trouble to fix or pitch it?

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[Razor]

Its a relic.. good for the museum of natural history for the Buick.. as goes with any system that old. Retire it properly