2005 90 hp 2 stroke wiring?

having a brain disfunction trying to figure out where to put the power cable from the battery to the motor. can't seem to remember. also, is it possible to have a connector that has nothing to plug in to? could be something for the dash such as oil sensor or what ever. boat is simple, tach and volts is it. plug is green/red, green, pink, and grey

[boats.net]

The Trim/Oil harness going to tach connects to the connector for warning lights and trim gauge.