Below are some basic steps to checking your tire pressure.

The basic steps consist of the following:
One must determine the proper tire pressure for their vehicle. Most vehicle manufacturers place it either in the driver’s side door jam, console lid, or glove compartment door.

Tire pressure increase with heat so it is best to check your tire pressure when the tire is cold not after you have driven a few miles

The first set should be remove valve stem cap of tire to be checked with working tire gauge Place tire gauge over valve stem until pressure is read. You may hear a slight hissing sound. This is normal as some air will escape.

If your tire pressure is low use the air pump to fill it to the proper pressure. Use the gauge constantly to check to make sure you do not over fill.

If you do at any time over fill the tire remove air by pressing on valve stem needle. You’ll hear a hissing sound - this is normal. Re-check tire until properly filled. 
After you have made sure your tire pressure is to manufacture specification I use a device called tire pressure alert. This unit replaces your existing vale cap. The unit measures your tire pressure constantly. If your tire pressure falls 4psi below the initial filled pressure then the valve cap blinds red. This warns you if in any way you are losing tire pressure.

The tire pressure Alert vale cap is great because you’re able to detect any lost of air pressure before you travel. I would highly recommend using such device, its hands free, no need to kick the tire or use a tire gauge after the first fill up and installation of unit.  This unit works also on most motorcycles, SUVs and trucks. To pick up these special tire monitor valve caps please go to www.tirepressurealert.com.