The SailTimer Wind Instrument RB is wireless and solar-powered. For boats of all sizes.
No wires to install down your mast. Works with lots of great Android/iOS apps (no other screen needed). Or use Air Link below for NMEA wiring to chartplotter/MFD. Comes with all mounting hardware needed. You can even raise it on a halyard without lowering or climbing the mast.
Remarkable innovations in this new model: Carbon-fiber pointer arm to reduce weight, with battery inside the nose cone for balance. New injection-molded tail. New wind cup bearing and stainless steel axle. Transmission range of 280 feet (85m) for even the tallest masts.
Go here for SailTimer reviews.