... Connection 3.CE,Rohs Tire Pressure Gauges used in Air Compressors,Hollow Pumps,Air-Pressure Piping,Pressure Regulating Values,Testing Equipment, ... Dial Size: 1.5" (38mm) / 2" (50mm) / 2.5" (63mm) / 3" (80mm) / 4" (100mm) / 6" (150mm)3. Pressure Range: vacuum, ... 10,000psi (customer-made pressure range)4. Connection: Bottom (Vertical), Center Back (Horizontal), Lower Back,5. Connection Size: 1/8 ...