Honda BF35A-BF45A Outboard Motors Shop Manual., Page 460Get this manual
METER WIRE HARNESS CONNECTION Route and connect the wire harness properly as shown in the wiring diagramUse the genuine Honda wire harness and modify it if necessary NOTE: Stake the lead wire against the terminal securely
using the special toolUse the 1.25 dia(AWG #6) lead wire to put them togetherSolder the joint section and protect it by wrapping with piece of insulation tapeCAUTION: First, check the the harnesses are connected as shown the wiring diagram, then connect the battery and turn the power switch ON check for proper condition of the electrical parts and wire harnessWrap the free terminal with piece of vinyl tape or equivalent insulate them securelyBefore reconnecting connectors, check the carefully make sure that their terminals are not bent, exposed, or disconnectedIf terminal is oxidized or corroded, remove the oxidation or corrosion with nonconductive plastic scrub pad and contact cleaner before reconnecting