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Try this link, also look at the instruction form for the product on the page.https://www.rockauto.com/en/moreinfo.php?pk=660983&cc=1030217&jsn=452Looks fairly straight forward. Also check Digikey for rocker switch.
You are quite welcome for the assistance. Yet, thanks should go to Hatzie. All that I did was to reference his thread.
If the original wiring appears to be in good physical condition and there is excellent continuity, I would repurpose the existing wires. You will still need to route a new ground wire to the switch. Solder the terminal crimps to the wires using 60/40 rosin core. If you decide to string new wire, I recommend GXL or SXL. With new wire you could eliminate the pigtail off the 6-way selector valve connector and terminate the new wires with new Weatherpack terminals for direct insertion into the connector doing away with external butt splices that might corrode. Otherwise, shrink-seal all exposed splices using marine grade heat shrink.