No Im using a/c gauges that has a low and high side. The problem is that both fitting/adapters on the gauges high and low side are the same size and you can adjust them to fit the most connector. I punch a can of R134 with a regular refill a/c hose made to connect only to cars with R134 connectors.

Srcewed hole in can, connect to the a/c system with hose from can while the engine at idle. Turn the climate control inside the cab to high. Unscrew the valve to release freon and nothing happen just freon leaking out the hose where the valve is until I open it all the way. Compressor wont engage and can doesnt get cold nor empty.

Discount the hose from the system after closing valve to can. Hooked up one side of the gauges to the same connector, got no pressure.