Calibrating a Pressure Guage is not that hard to do. All you need is a standard pressure source such as a Dead Wheight Tester, Tele Tester, etc. and also know how to use them. What part of the calibration do you feel difficult?
What do you mean about training doc? If you want to calibrate the gauge, just use the dead weight tester or portable hand pump, but its depend on you gauge range.. ;)
For specifics of what to adjust for Wika's gauges, Google search for
Calibration Procedures for Field-Calibratable Movements
Wika's single page document on such will most likely appear as the first item, along with an assortment of other documents related to pressure gauge calibration.
Gauge Calibration
Re: Gauge Calibration
