I put a chrome dry chemical extinguisher on the tunnel of my Healey because I thought it looked cool.
Never thought I'd need it until a fuel leak from the carb, lit up the engine compartment. I spotted the flames through the hood louvers and was able to grab the extinguisher and shoot through the louvers to knock the fire down pretty quickly. Paint damage to the hood, burnt up wiring, some interior carpet damage, but if I didn't have the extinguisher it would have burnt to the ground. Keep one handy.