We often are asked about wireless Kitchen Printers and if we reccomend any of them. the answer used to be no but we have recently tested and begun selling a bluetooth adapter that works great with SAM4s Cash Registers and Kitchen Printers. We have not yet tested them on Sharp Cash Registers but I don't see why they would not work as well as the SAM4s registers.
Cost about $250.00 for the adapters plus the cost of the printers. This is often less then the cost of installing cable in a difficult situtaion.