Wireing Diagrams

[MRLIFT]

My Twin 1990 Yamaha 250's Had A Lighting Strick All Electronics Fried Have Service Manuel But Only Gives Wire Without Identifing What Wire Goes From Say Temp Sender To Guage I Understand There Is A Rigging Manuel But Have Not Been Able To Locate

[boats.net]

If you are talking about the temp warning light in digital gauge then it's the grey wire.