If you have original wiring or original style wiring check out some of the old flarestat or other vintage hazard kits. The basically connect inline with existing wires and have a nice toggle switch. About 40.00 of you watch them on eBay. if you have a new wiring system just check for a schematic and run a toggle.
Is it wired with an aftermarket kit? My aftermarket kit had a circuit in place for hazards. I used a bronco emergency switch and the bezel from the same bronco for mine only because I wanted the pull switch like the lights and wanted it mounted in the dash (so needed a bezel). Toggle switches work as well and could be mounted under the dash.
Many of the 12 volt harnesses have them built in, like this one. https://www.ebay.com/itm/232355490951?hash=item3619776c87:g:eTQAAOSw4GVYNItN Or this one that includes a few extras https://www.ebay.com/itm/223916936315?hash=item34227d4c7b:g:2t0AAOSw49lhq5Y2
I'm following this thread as I'd like to add 4 way flashers to my '56. I've seen a few on ebay but only the pricey ones have any instructions and none had a good enough photo of the instructions. I'd had to cut any of my original wiring under the dash. It still all looks like new. Was it possible to just plug in a harness to headlight switch?
Or you might want to grab this. https://www.facebook.com/commerce/listing/685446795896396/?ref=share_attachment
Posting photos. Let’s see if this works. I happen to have a few of these but have not had a chance to install them. I have enough cars for them so NFS.
If you follow the schematic you can see the power coming from the ammeter, which instead you can find a hot to stick it to or just go back to the batter. But maybe headlight switch? A splice connector would work to tap into each line
So it looks like you need to splice into your wiring. It doesn't look like you just connect it to the headlight switch.
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