Just one thing to think about, depends on your electrical system.
Most Dip switches are make-before-break, that is they momentarily connect both filaments, before turning off the one you are leaving behind. In that way, you don't get a momentary voltage surge that could break other bulbs in circuit (tail lamp, speedo bulb, etc). This switch switches between filaments.
Having said that, it does switch very quickly - so the problem may not/should not occur.
It worked OK for me, but I'm still running in - so no high engine speeds/voltage outputs were involved!