I took a look @Xfaxman suggested reading. Looking like the power from those wires come from the ecm off the motor I think which is fine for a beeper. At any case, it seems like there can be a trickle of voltage coming through when in forward too. So then youd want to install a relay, which means you are running power from the 12v posts upfront. At that point I don’t know if it’s just easier / more sensical to put it all onto a dash switch and not mess with buzzer cables at all.