Don't buy the Shallco brand rotary switches. They get so loose after about a year you can't tell what function you're on. They're hardly even cheaper than Electroswitch that can last 10 years or more.
Get some of these:
https://www.digikey.com/products/en?keywords=335-1136-ND
Put a dab of silicone or dielectric tune-up grease on the shaft under the boot and it won't rust.