Attached is an Application Note from NI that describes the wiring of three-wire, quarter-bridge, strain gauges. There were dozens of App Notes to choose from, I just sent this one as a start.
You can find all of them by going to the Support Section of the NI Web Site, Choose >>Option 3>>Tutorials and Application Notes>>Sensors>>Mechanical (pressure/strain)
There you will find a great deal of information>