Electrics Adapting standard dash knobs

Alright lads,

bought air ride for the front of my 1970 bug.
I need to sort out an on/ off switch for the compressor and
I got thinking - previous owner bored a hole in my dash, between
the two knobs above the radio.

Is there any way I could buy another knob and re-purpose it for the compressor on/off. which one would I use? probably the wiper one? idk, any advice would be greatly appreciated.

Cheers,
Jack
:mental: