Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 87Get this manual
Wiring Installation
Panel Mount Remote Control
(-t) 12 Volt Te rminal (-) Ground Terminal Speedometer Tachometer Tachometer Signal Terminal Connect Wires Together with Screw and Hex Nut (3 Places); Apply Quicksilver Liquid Neoprene to Connections and Slide
Rubber Sleeve Over Each Conneclion Power Trim Connector Horn Pin Harness Connector Multi-Function Gauge
To Fuel Sender (Optional) To Oil Sender (Optional) Two Wire Harness IgnitionChoke Switch Low Oil Sender Lead Panel Mount Remote Control To Engine To Engine Neutral Safety Switch Lead