Look here for Wireless Transmitter and Display Instruments. We stock performance instrument systems and GPS-integrated meters and software from great brands like Tacktick and Velocitek.
These instruments feature easy installation too - A typical installation can be done in just a few hours, with your rig in place and your boat still in the water, plus there's no need for holes in the bulkhead or wires down the mast. Find some that are solar-powered. Most are lightweight and completely sealed for life - that means these are not only waterproof but have no condensation problems either!