Hi, that sensor uses TTL Serial so if you have an INDIO, you can use the hardware serial ports on the IDC expansion connector. If the IDC connector is already taken (for Ethernet or GSM/GPRS) you can probably use the RS485 port by adding a common TTL/RS485 converter in between. Or look for a finger print sensor that uses RS485.
If you have a PROTO, you could simply use the screw terminals.
Please try to give a substantial answer. If you wanted to comment on the question or answer, just use the commenting tool. Please remember that you can always revise your answers - no need to answer the same question twice. Also, please don't forget to vote - it really helps to select the best questions and answers!