I have the HF AC gauges for 134A, go to check my daughters Hyundai and quickly find the hoses won't fit.
So I learn there is now a much more expensive freon, R123yf, good thing they made the fittings different.
I see I can buy the 1234yf fitting adapters for the 134 hoses, good or bad idea?

Any downside to the residual R1234yf in the lines for the next time I use it for 134?
Not interested in buying another gauge set for the 1234 freon.

Thx