MarineEngine.com does not offer troubleshooting assistance or repair advice by email or by telephone.
You are invited to join our public Boat Repair Forum to seek assistance from other members.
You may also visit the Boat Motor Manuals section of our site to obtain a service manual.
Just use house power for the fuel guage the same as hot to the light switch. Do you have a accy switch or master power?
Do you have master power to the helm? You can use power for the fuel guage there. It does not have to be from the ignition switch. Your master power is on when the engines are running correct?