Amazon....

You could use one kill switch and wired to two relays. The kill switch could be the live or negative supply and engine Ignition running through the switched side.

it`s been 20 years, I think he`s got it figured out by now.
Why do people bring up these ancient threads, another BOT?

Well thanks for that... as a newbie here and looking for help on a boat problem and... no idea how the forums work also having to post 10 times before I can look at my 10 private messages on here (concerning my problem) I thought, if someone came looking for help on the same problem as that guy, then my answer would help someone else too. Sorry if I bothered you... oh Happy Easter.
does this count as 2 posts now.....asking for a friend?

]it`s been 20 years, I think he`sgot it figured out by now.
Why do people bring up these ancient threads, another BOT?[/QUOTE]

Maybe a BOT but it is this simple. Mercury dual tethered kill switch #87-19674A12 on eBay $45 Done