My horns are not working, I've checked and get power to both so I'm guessing it's the horns themselves. I am thinking I'll replace them and take my time taking them apart to fix when I get around to it. So today's question is what do people suggest? I found this set that seems like a good option: https://www.godzillaraceworks.com/electrical/hella-supertone-horn-kit-for-datsun-240z-260z-280z-280zx-fairlady-z I know that the red will stand out, i could always paint them black.

Do they have good grounds? Have you tried to bench test them?

I put a set of Jaguar horns on my '83 Turbo back in the day. Great sound and always surprised people that is wasn't the typical Japanese "meep!" I wish I could remember what model I lifted those from.

Have you tested or tried to rebuild the horns?

The FSM describes how to adjust the horn sound and its actually very simple (screw on the back with a locking nut). Not saying they'll sound like a Jag, but altering they way they sound is possible. I believe each horn is set to a different tone.