Where can I get a wiring diagram for a Yamaha speed/fuel Jun 23, 2012Where can I get a wiring diagram for a Yamaha speed/fuel gauge #6Y5-2818R-50 - Answered by a verified Marine Mechanic Where does the wire from the fuel tank sending unite connect to ? Wiring diagram to install new 6y5-8350t-83-00 tech gauge on a 150 hp, 1999 Yamaha outboard , from the old gauges. Wiring Diagram (Yamaha Gauges) - Yamaha Outboard Parts Forum Sep 07, 2015Ask the experts on our Yamaha Outboard Forum for repair issues, diagnosing problems, links to diagrams, suggestions on buying parts and more. white wire goes to post terminal on fuel tank sending unit. Black wire goes to sender ground. Look at your fuel gauge sender/float where it`s mounted on the tank and see the wire.