This part was used for many years and I have even seen a listing for an M20K that uses this same switch.

It functions as it should.

Mooney M20C and possibly M20B D E F & G Throttle Warning Micro Switch.

Early 60s And Probably More. This was mounted in Mooneys on the throttle cable and activated the gear warning if the throttle is closed before the gear is lowered. It is on the throttle cable right behind the control panel.

Possibly used in Piper Cessna Beechcraft and for sure good fo Experimental and homebuilt aircraft.