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Hello. My name is Tan.
I don't think there is a kill switch on this engine. But if there is it would be next to the control or the key switch.
Do you have a volt meter to do some voltage tests.
When you turn the key switch to on position do the gauges come on?
If yes then check for voltage at the ignition coil [positive terminal key on do you have voltage? If no voltage check the main engine wiring harness plug where the boat harness plugs in to the engine harness. Pull plug apart check pins then reconnect pushing the plug together real tight.
Post back with findings and questions.