Engine Instrument Wiring Made Easy - boats Beginning with the tachometer, Fig. 1 here shows the back of a typical gauge. At the top left of the diagram, we see the cylinder selector switch. Most vendors will use one tachometer head to cover a variety of engines. Make sure this switch is set to the number of cylinders for your engine. Evinrude Wiring Harness Diagram | Wiring Diagram Apr 11, 2019Evinrude Tachometer Wiring | Best Wiring Library β Evinrude Wiring Harness Diagram Wiring Diagram comes with several easy to adhere to Wiring Diagram Guidelines. Itβs meant to help all the typical consumer in building a proper method. How to Wire a Boat Tachometer | Gone Outdoors | Your Slip one of the ring connectors on the green wire onto the terminal post on the back of the tachometer marked "GND." Remove one of the screws on the boat's common ground, slip the connector on the other end of the black wire over that screw and thread the screw back into the common ground, tightening the screw with a screwdriver. Related searches for omc tachometer wiring diagram omc tachjohnson outboard tachometer wiringevinrude tachometer wiring diagramoutboard motor tachometer wiringoutboard tachometer wiringomc wiring colorsevinrude tachometer wiringomc outboard tachometer