(1) 763517 Adapter for the motor to the GPS Antenna in the rear (it come with a T connector to tie it in) & (1) 763507 I-Command Digital Gauge to replace the existing Tach (it also comes with a T connector to tie it in). The system should work with the EMM on a single engine application unless someone changed something. The trim sender will need to be synchronized with the EMM if you want the trim function to work properly (you will need either a trim gauge, I-command ignition/trim harness """OR""" a 47ohm 5 watt resistor (install in a particular place for your standard engine harness) for the trim function to work.) Make sure the firmware in the existing Lowrance unit is up to date. Also make sure the engine map is up to date. Older Lowrance Unit Firmware can bombard the EMM with to many requests at once. If you want full function of the fuel management info you will need the optional items that can be put on at a later date. Memory Module & Analog Fuel Sender Signal Converter.