For $ 20, you can buy a great analog or digital tire pressure gauge. (bestride.com)
The only way to tell for sure is to put a fuel pressure gauge on the fuel rail and test it when it's behaving as such. (mechanics.stackexchange.com)
An air regulator provides better air control and an easy - to - read pressure gauge help you stay on top of the output, while a moisture filter works to keep everything dry. (geekwrapped.com)