Batboard

Can I wire my airhorn onto my radio thru an output using an option button that has already been programmed for another usage? (such as making one a short press and the airhorn a long press)

you should be able to do this through pins, I do not know what pin is horn/siren but you can probably tie it in through there and specify in the CPS Programming what button will activate it, you can also specify long press short press in the CPS

I believe the usable pins are 3,4,6,8,12,14