I have an 05 tC with ~73k miles on it. I added some refrigerant and wanted to share it to see if they make sense. The pressure is much higher after refilling but i am not really seeing much difference in cooling! :--/

The gauge i used was what came with AC pro.

Refrigerant Used: AC Pro (ACP-102) 10z Ref, 2oz oil

Before Refill:
W/Compressor Off: ~24 psi
W/Compressor On: ~30 psi

compressor kicks in every 20 seconds or so

After Refill:
W/Compressor Off: ~35 psi
W/Compressor On: ~50 psi

 

After the refill.