For Sale is a WIKA 4-1/2" front gauge that goes from 0 - 30 PSI.  This is new and unused but old stock.  I obtained at an inventory reduction sale.  The front actually measures approximately 5" across from outside edge of case to outside edge.  The back measures approximately 5-7/8" from outside edge to outside edge (see photos).  Pipe size is 1/4".