I got two little beepers and hooked them in parallel with the turn signals. They worked great, the left one wore out after five years, so I order another. Less than $4 each for two https://smile.amazon.com/Icstation-85dB-Active-Piezo-Electronic/dp/B01LAYWUDO/ref=sr_1_3?ie=UTF8&qid=1532963249&sr=8-3&keywords=12v+beeper
Yeah I wasn’t too fond of buzzer/beepers. if I can find something that is less annoying sounding i might consider it.