Can't help you with the first part (machinery/monitor setup), but after you have collected the data you have several software options to use:
GeoPard (web-based), check the Yield data analytics article
SMS advanced (desktop)
JohnDeere Ops center (web, more useful for just visualization at the moment)
QGIS / ArcGIS desktop software
You can drop me the files via email, will demo how it works.