So i need help

I plan on wiring some switches and putting them on my dash but i need help figuring out how to wire them. I want to have two switches one to switch the stock horn on and off and one to switch my train horn on and off, but then as i was researching, someone mentioned a three way switch and i realized how stupid i was to not think about this. So can someone explain how to wire my stock horn and train horn to a three way switch. Also, can anyone explain how to wire the compressor so it only works when the key is on and i do plan on putting another master switch on that in my dash

No offense, but I’m not even sure how to begin to help you. I say this because you seem to be missing some critical fundamentals of 12v auto wiring – such as the concept of a +12v IGN (ignition) wire … which suggests other fundamentals (wire sizing, voltage drop, the importance of good grounds, etc.) may also be missing.

I’m happy to render assistance, but I’m unable to teach fundamentals due to time constraints.

Here’s a few helpful threads which most likely hold the answers you’re looking for. Have a read of these and get back to us with any questions

https://www.trainhornforums.com/showthread.php?t=6529
https://www.trainhornforums.com/showthread.php?t=6469
https://www.trainhornforums.com/showthread.php?t=6286

I would recommend just having a separate button

A separate button I think is the best thing to do. It’s easier, plus if you forget to switch back to your stock horn and end up blowing the train horn near a cop or hospital etc. it could get you in trouble.