Re-Charging Air-Conditioning on 2001 Passat?

I just bought a recharging air-conditioning for dummies, and I have done a recharge before but on a 97 Saturn. I found what I believe to be the low-side port that it needs to plug into and when I try to plug it in it appears as if i does not fit and it sprays the coolant from the port all over the place. Am I doing something wrong or is does the gauge that I have not work on my car?
Re-Charging Air-Conditioning on 2001 Passat?
If the ports don't match, quit trying something is definitely not right. Make sure your compressor is free and the expansion valve works. If it doesn't take the charge, most likely expansion valve.

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