Keeping a tire pressure gauge in the car is a great tip on its own. If you keep it somewhere handy, you'll remember to check the tire pressure regularly. Reader justagigilo85 suggests keeping it in your trunk—easier to get to, and you remember to check the pressure on your spare every time you check the other tires.
via Web News Blogs http://lifehacker.com/keep-your-tire-pressure-gauge-in-the-trunk-so-you-check-1449793525