Check oil pressure in automatic transmissions and engines . Adapters provide coverage of most domestic and imported cars and light trucks including late models. Supplied with two gauges calibrated as follows: . Large Gauge: 0-600PSI, 0-4,000 kPa, 0-40 Bar. Small Gauge: 0-50PSI, 0-3.5 Bar Large gauge can be used for all applications and has a hang- up hook. Use small gauge for more accurate reading of engine oil pressure where maximum oil pressure does not exceed 50 RS.I. (3.5 BAR). Includes 6 feet of oil proof hose and 10 assorted fittings. Supplied in a durable, plastic molded storage case with carrying handle. Case measures 11-1/4 x 7-1/2 x 3 and has ample space for additional adapters and parts. Full instructions provided. Now includes an adapter with two grooves, Cat. No. 34573, for use on most Asian and some American and European vehicles. Thread size is 8MM-1.00 Male x 1/8 NPT Female..