With motor homes (and trucks) that have dual wheels it is critical that tire pressures be kept equal and at the proper psi. The Milton S976 is the most accurate gauge I have ever used. Its dual head is small enough to fit into the ports in the stainless wheel covers and makes it easy to reach the stem of the inside tire. You might pay a lot more for a gauge but you can't get anything better. The only down side is the size and weight. You won't be carrying it around in your shirt pocket.