[vref120]

You could set up like an aircraft extinguishing system. Need a fire loop and a squib bottle. They are fairly easy systems. Fire loop once heated to a certain temperature, creates an electrical contact and provides the visual cue (in a 737 this is a light and a bell), and arms the squib. A separate button or handle fires the bottle. A squib bottle for a smaller turbine would be your best bet, but after you discharge it, run away.