Smartcraft MercMonitor Questions
 

Looking to replace the stock speedo and would install this but looking for anyone that has some real world knowledge. Where does this get its GPS info from?

http://www.livorsi.com/catalog/merc_monitor.htm

You need a gps puck antenna to get speed or a complete gps system for data. if your boat has the 14 pin wiring harness 06 an up I think dont quote me on that you should have the plug for the harness under the dash.