The pressure of the nitrous inside the bottle has an effect on the nitrous flow rate and overall performance of the system. For optimum results in all conditions, it is therefore wise to know the nitrous pressure, so you can take appropriate action. If the pressure of the nitrous inside the cylinder increases, so too will the nitrous flow and if the pressure drops then the opposite is true. Although the nitrous flow may vary, the fuel flow will remain unchanged, which could be potentially dangerous if the pressure becomes too high and causes a lean mixture. The worst possible outcome is engine damage, therefore monitoring the nitrous pressure is a good precaution. As temperature and pressure are directly linked, the pressure is most likely to become a concern in warm weather. In cold climates, low nitrous pressure can be detrimental to performance, which can be corrected by fitting a bottle heater. To make sure that the bottle doesn't become too hot and the pressure too high, a gauge should be fitted.