Can I use the GMac gauge set on the R410A systems?
The answer is generally, No. The R410 systems are at higher pressure(700 PSI) and beyond the range of the regular gauge set(500 PSI). If you do not have the R410 gauge set and need to use your regular gauge set on R410 system, you will need an adapter set of 5/16″ FFL X 1/4″ MFL to do the services.