I have mine wired up to a 12V Relay 2CH Wireless RF Remote Control Switch Transmitter Receiver. Similar to this

https://www.amazon.co.uk/Amazingdeal365-Wireless-Control-Transmitter-Receiver/dp/B01N9HGL7N?th=1

I have a non STD steering wheel with a horn button, so i wired up the transmitter to that, works well for me.