Low Charge?

I measured the pressure on the low- and high-pressure side of the car today, Results as follows:
Outside temperature - 86F
Pressure low side - 26 psig
Pressure high side - 180 psig
Temp out of vent 62F
From these results, it looks like low charge. Should I recharge after having the refrigerant evacuated at a shop?
I enclose a video of the engine and A/C running during the measurement. There is a click-click sound that can be heard in the background. Can you tell me what this sound denotes? Hope it doesn't have to do with the compressor.