Pressure gauges are need for both....as close to 950 on the bottle which is around 85 degrees or so. Bottle heaters are usually needed. Around 5.5 on the fuel...flowing thru a 75 jet or your plate. Once a bottle gets to around 17 pounds, there isn't a full pass left in it for me anyway. Don't forget about timing. Like sex...Read read read before you spray if it's your first time.