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I'm gonna try my best to work on my buddys A/C on his 3rd gen Camaro. I've converted my 86 truck A/C to R134a the proper way by getting a new compressor and flushing and evacuating the entire system. It's been over 5 years and it works great. He saw what I did and he is willing to get me a 30 pack and a pizza to do his.:beers: I have done a few already and I always like getting a fan in front of the condensor. Well, I might as well invest in getting proper gauges. He wants to use a product called "FREEZE-12" which it claims works as an R12 replacement. I'm still flushing and evacuating his A/C system (local shop only charges me $40) but I have a few questions,

Freeze 12 is a blend of refrigerants, Should I get R134a manifold gauges?

Since it is a R12 A/C system should it be R12 gauges, or the R134 gauges work?

I thought the PSI readings on all gauges were the same. If I have 40psi on a R134a gauge, shouldn't the psi be the same on a R12 system? even if there is different type of refrigerant?

Thanks guys
 

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Use the R-12 gauges because there is not the quick disconnects of R134A. Use temp gauge to monitor evap temp, just as you would otherwise. Yes, 40 PSI is 40 PSI.
 
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